vue/src/__tests__/httpAuthInterceptor.spec.js

@@ -0,0 +1,72 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest'
+import { useFeeds } from '../composables/useFeeds'
+
+// router/index.js's route definitions lazily import(...) the view components,
+// which importing the real module would still be safe to do (the imports
+// themselves aren't eagerly evaluated) — but mocking it keeps this test from
+// depending on the app's actual routes and lets currentRoute/push be
+// controlled directly.
+vi.mock('../router', () => ({
+  default: {
+    currentRoute: { value: { name: 'feeds' } },
+    push: vi.fn(),
+  },
+}))
+
+import router from '../router'
+import { handleUnauthorizedResponse } from '../httpAuthInterceptor'
+
+describe('handleUnauthorizedResponse', () => {
+  const { feedFilter } = useFeeds()
+
+  beforeEach(() => {
+    localStorage.setItem('user-token', 'abc123')
+    localStorage.setItem('user-id', '7')
+    localStorage.setItem('feedFilter', JSON.stringify(['Feed A']))
+    feedFilter.value = ['Feed A']
+    router.currentRoute.value.name = 'feeds'
+    router.push.mockClear()
+  })
+
+  it('clears the session and the feed filter, and redirects to login, on a 401 from a non-login route', async () => {
+    const error = { response: { status: 401 } }
+
+    await expect(handleUnauthorizedResponse(error)).rejects.toBe(error)
+
+    expect(localStorage.getItem('user-token')).toBeNull()
+    expect(localStorage.getItem('user-id')).toBeNull()
+    expect(localStorage.getItem('feedFilter')).toBeNull()
+    expect(feedFilter.value).toBeNull()
+    expect(router.push).toHaveBeenCalledWith({ name: 'login' })
+  })
+
+  it('still clears the session on a 401 but does not push again when already on the login route', async () => {
+    router.currentRoute.value.name = 'login'
+    const error = { response: { status: 401 } }
+
+    await expect(handleUnauthorizedResponse(error)).rejects.toBe(error)
+
+    expect(localStorage.getItem('user-token')).toBeNull()
+    expect(router.push).not.toHaveBeenCalled()
+  })
+
+  it('leaves the session and filter untouched, and still rejects, on a non-401 error response', async () => {
+    const error = { response: { status: 500 } }
+
+    await expect(handleUnauthorizedResponse(error)).rejects.toBe(error)
+
+    expect(localStorage.getItem('user-token')).toBe('abc123')
+    expect(localStorage.getItem('feedFilter')).toBe(JSON.stringify(['Feed A']))
+    expect(feedFilter.value).toEqual(['Feed A'])
+    expect(router.push).not.toHaveBeenCalled()
+  })
+
+  it('leaves the session untouched and still rejects on an error with no response (e.g. a network error)', async () => {
+    const error = new Error('network')
+
+    await expect(handleUnauthorizedResponse(error)).rejects.toBe(error)
+
+    expect(localStorage.getItem('user-token')).toBe('abc123')
+    expect(router.push).not.toHaveBeenCalled()
+  })
+})

vue/src/components/AppNav.vue

@@ -2,29 +2,27 @@
 import { ref, computed, onMounted, onUnmounted } from 'vue'
 import { RouterLink, useRouter, useRoute } from 'vue-router'
 import { useFeeds, logout as logoutSession } from '@/composables/useFeeds'
+import FeedFilter from './modal/FeedFilter.vue'
 
 const router = useRouter()
 const route = useRoute()
 const { sync, viewMode, toggleViewMode, layout, toggleLayout, markAllRead, feedFilter, feedTitles, setFeedFilter, unreadCount, displayedFeedUnreadCounts, refreshUnreadDisplay, lastProgrammaticScroll, isSyncing } = useFeeds()
 
 const headerRef = ref(null)
+const filterBtnRef = ref(null)
+const filterModalOpen = ref(false)
 
-// Native <select>/<option> has no "is open" state — the closed box just shows
-// the selected option's text verbatim, so per-option unread counts can only be
-// toggled based on focus, since the popup is only ever shown while focused.
-// @focus ~ opening (shows counts); @change (picking an option closes the
-// popup but keeps focus, so no blur fires) and @blur (focus left without
-// picking) ~ closed (counts hidden, so the closed box just shows the name).
-const filterOpen = ref(false)
-
-function onFilterFocus() {
-  filterOpen.value = true
+function openFilterModal() {
   refreshUnreadDisplay()
+  filterModalOpen.value = true
 }
 
-function onFilterChange(event) {
-  setFeedFilter(event.target.value || null)
-  filterOpen.value = false
+// setFeedFilter() itself no-ops (order-insensitively) an unchanged selection,
+// so there's nothing to check here before applying it.
+async function handleFilterClose(selection) {
+  filterModalOpen.value = false
+  await setFeedFilter(selection)
+  filterBtnRef.value?.focus()
 }
 
 // Scroll-driven show/hide: the header slides out of view on scroll-down and
@@ -166,18 +164,31 @@ function handleToggleLayout() {
         class="app-nav__sync-spinner"
         aria-hidden="true"
       ></span>
-      <select
+      <button
         v-if="onFeedsPage && feedTitles.length"
-        class="app-nav__filter"
-        :value="feedFilter ?? ''"
-        aria-label="Filter by feed"
-        @focus="onFilterFocus"
-        @change="onFilterChange"
-        @blur="filterOpen = false"
+        ref="filterBtnRef"
+        class="app-nav__filter-btn"
+        :class="{ 'app-nav__filter-btn--active': feedFilter !== null }"
+        type="button"
+        aria-haspopup="dialog"
+        :aria-expanded="filterModalOpen"
+        :aria-label="feedFilter !== null ? 'Filter feeds (active)' : 'Filter feeds'"
+        :title="feedFilter !== null ? 'Filter feeds (active)' : 'Filter feeds'"
+        @click="openFilterModal"
       >
-        <option value="">All feeds</option>
-        <option v-for="title in feedTitles" :key="title" :value="title">{{ title }}<template v-if="filterOpen"> ({{ displayedFeedUnreadCounts[title] ?? 0 }})</template></option>
-      </select>
+        <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true">
+          <polygon points="22 3 2 3 10 12.46 10 19 14 21 14 12.46 22 3"></polygon>
+        </svg>
+      </button>
+      <Teleport to="body">
+        <FeedFilter
+          :show="filterModalOpen"
+          :titles="feedTitles"
+          :counts="displayedFeedUnreadCounts"
+          :selected="feedFilter"
+          @close="handleFilterClose"
+        />
+      </Teleport>
       <button
         class="app-nav__hamburger"
         type="button"
@@ -283,25 +294,37 @@ function handleToggleLayout() {
   }
 }
 
-.app-nav__filter {
-  flex-shrink: 1;
-  min-width: 0;
+.app-nav__filter-btn {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  flex-shrink: 0;
+  position: relative;
   min-height: 44px;
-  max-width: clamp(90px, 40vw, 220px);
-  padding: 0.25rem 0.5rem;
+  min-width: 44px;
+  padding: 0.5rem;
   border: 1px solid var(--color-border);
   border-radius: 4px;
   background: transparent;
   color: var(--color-text);
-  font: inherit;
   cursor: pointer;
-  text-overflow: ellipsis;
 }
 
-.app-nav__filter:hover {
+.app-nav__filter-btn:hover {
   border-color: var(--color-border-hover);
 }
 
+.app-nav__filter-btn--active::after {
+  content: '';
+  position: absolute;
+  top: 6px;
+  right: 6px;
+  width: 8px;
+  height: 8px;
+  border-radius: 50%;
+  background: var(--color-accent);
+}
+
 .app-nav__hamburger {
   display: inline-flex;
   align-items: center;

vue/src/components/__tests__/AppNav.spec.js

@@ -4,6 +4,7 @@ import { nextTick } from 'vue'
 import { createRouter, createWebHistory } from 'vue-router'
 import axios from 'axios'
 import AppNav from '../AppNav.vue'
+import FeedFilter from '../modal/FeedFilter.vue'
 import { useFeeds } from '../../composables/useFeeds'
 
 vi.mock('axios')
@@ -218,7 +219,7 @@ describe('AppNav', () => {
     expect(wrapper.find('.app-nav__unread').exists()).toBe(false)
   })
 
-  it('renders a feed filter with an "All feeds" option plus one per distinct feed', async () => {
+  it('opens a feed filter modal listing "All feeds" plus one entry per distinct feed', async () => {
     const { allItems } = useFeeds()
     allItems.value = [
       { id: 1, feedTitle: 'Feed B', title: 'a', url: 'https://example.test/1', timestamp: '2026-01-02' },
@@ -228,41 +229,21 @@ describe('AppNav', () => {
 
     const wrapper = mountNav()
     await flushPromises()
-    const select = wrapper.find('.app-nav__filter')
 
-    // Counts only show while the dropdown is open (focused) — see AppNav.vue.
-    await select.trigger('focus')
+    await wrapper.find('.app-nav__filter-btn').trigger('click')
 
-    const options = select.findAll('option').map(o => o.text())
-    // "All feeds" first, then distinct titles sorted alphabetically, each with
-    // its unread count.
-    expect(options).toEqual(['All feeds', 'Feed A (2)', 'Feed B (1)'])
-  })
-
-  it('hides the per-option unread count once the feed filter is closed', async () => {
-    const { allItems } = useFeeds()
-    allItems.value = [
-      { id: 1, feedTitle: 'Feed A', title: 'a', url: 'https://example.test/1', timestamp: '2026-01-01' },
-      { id: 2, feedTitle: 'Feed A', title: 'b', url: 'https://example.test/2', timestamp: '2026-01-02' },
-    ]
-
-    const wrapper = mountNav()
-    await flushPromises()
-    const select = wrapper.find('.app-nav__filter')
-
-    await select.trigger('focus')
-    await select.setValue('Feed A') // fires change, which closes the popup but keeps focus
-    await flushPromises()
-
-    const feedAOption = select.findAll('option').find(o => o.element.value === 'Feed A')
-    expect(feedAOption.text()).toBe('Feed A')
+    const modal = wrapper.findComponent(FeedFilter)
+    expect(modal.props('show')).toBe(true)
+    // Distinct titles, sorted alphabetically, with per-feed unread counts.
+    expect(modal.props('titles')).toEqual(['Feed A', 'Feed B'])
+    expect(modal.props('counts')).toEqual({ 'Feed A': 2, 'Feed B': 1 })
   })
 
   it('does not render the feed filter when there are no feeds', async () => {
     const wrapper = mountNav()
     await flushPromises()
 
-    expect(wrapper.find('.app-nav__filter').exists()).toBe(false)
+    expect(wrapper.find('.app-nav__filter-btn').exists()).toBe(false)
   })
 
   it('applies the selected feed to the displayed list, and "All feeds" restores it', async () => {
@@ -275,14 +256,16 @@ describe('AppNav', () => {
     const wrapper = mountNav()
     await flushPromises()
 
-    const select = wrapper.find('.app-nav__filter')
-    await select.setValue('Feed A')
+    await wrapper.find('.app-nav__filter-btn').trigger('click')
+    const modal = wrapper.findComponent(FeedFilter)
+    modal.vm.$emit('close', ['Feed A'])
     await flushPromises()
 
-    expect(feedFilter.value).toBe('Feed A')
+    expect(feedFilter.value).toEqual(['Feed A'])
     expect(feeds.value.map(f => f.id)).toEqual([1])
 
-    await select.setValue('')
+    await wrapper.find('.app-nav__filter-btn').trigger('click')
+    modal.vm.$emit('close', null)
     await flushPromises()
 
     expect(feedFilter.value).toBeNull()
@@ -303,13 +286,128 @@ describe('AppNav', () => {
     // No filter → global total (3).
     expect(wrapper.find('.app-nav__title').text()).toContain('(3)')
 
-    await wrapper.find('.app-nav__filter').setValue('Feed A')
+    await wrapper.find('.app-nav__filter-btn').trigger('click')
+    wrapper.findComponent(FeedFilter).vm.$emit('close', ['Feed A'])
     await flushPromises()
 
     // Filtered → unread in Feed A only (2).
     expect(wrapper.find('.app-nav__title').text()).toContain('(2)')
   })
 
+  it('sums the unread count across every selected feed in the title badge', async () => {
+    const { allItems, feedFilter } = useFeeds()
+    allItems.value = [
+      { id: 1, feedTitle: 'Feed A', title: 'a', url: 'https://example.test/1', timestamp: '2026-01-01' },
+      { id: 2, feedTitle: 'Feed B', title: 'b', url: 'https://example.test/2', timestamp: '2026-01-02' },
+      { id: 3, feedTitle: 'Feed C', title: 'c', url: 'https://example.test/3', timestamp: '2026-01-03' },
+    ]
+    feedFilter.value = ['Feed A', 'Feed B']
+
+    const wrapper = mountNav()
+    await flushPromises()
+
+    expect(wrapper.find('.app-nav__title').text()).toContain('(2)')
+  })
+
+  it('marks the filter button active and swaps its label/title when a filter is set', async () => {
+    const { allItems, feedFilter } = useFeeds()
+    allItems.value = [
+      { id: 1, feedTitle: 'Feed A', title: 'a', url: 'https://example.test/1', timestamp: '2026-01-01' },
+    ]
+
+    const wrapper = mountNav()
+    await flushPromises()
+    const button = wrapper.find('.app-nav__filter-btn')
+
+    expect(button.classes()).not.toContain('app-nav__filter-btn--active')
+    expect(button.attributes('aria-label')).toBe('Filter feeds')
+    expect(button.attributes('title')).toBe('Filter feeds')
+
+    feedFilter.value = ['Feed A']
+    await nextTick()
+
+    expect(button.classes()).toContain('app-nav__filter-btn--active')
+    expect(button.attributes('aria-label')).toBe('Filter feeds (active)')
+    expect(button.attributes('title')).toBe('Filter feeds (active)')
+  })
+
+  it('tracks the modal\'s open state via aria-expanded on the filter button', async () => {
+    const { allItems } = useFeeds()
+    allItems.value = [
+      { id: 1, feedTitle: 'Feed A', title: 'a', url: 'https://example.test/1', timestamp: '2026-01-01' },
+    ]
+
+    const wrapper = mountNav()
+    await flushPromises()
+    const button = wrapper.find('.app-nav__filter-btn')
+
+    expect(button.attributes('aria-expanded')).toBe('false')
+
+    await button.trigger('click')
+    expect(button.attributes('aria-expanded')).toBe('true')
+
+    wrapper.findComponent(FeedFilter).vm.$emit('close', null)
+    await flushPromises()
+
+    expect(button.attributes('aria-expanded')).toBe('false')
+  })
+
+  it('does not re-apply the filter when the emitted selection is order-insensitively unchanged', async () => {
+    const { allItems, feedFilter } = useFeeds()
+    allItems.value = [
+      { id: 1, feedTitle: 'Feed A', title: 'a', url: 'https://example.test/1', timestamp: '2026-01-01' },
+      { id: 2, feedTitle: 'Feed B', title: 'b', url: 'https://example.test/2', timestamp: '2026-01-02' },
+    ]
+    feedFilter.value = ['Feed A', 'Feed B']
+
+    const wrapper = mountNav()
+    await flushPromises()
+    const scrollToSpy = vi.spyOn(window, 'scrollTo')
+
+    await wrapper.find('.app-nav__filter-btn').trigger('click')
+    wrapper.findComponent(FeedFilter).vm.$emit('close', ['Feed B', 'Feed A'])
+    await flushPromises()
+
+    // setFeedFilter() always scrollTo(0, 0)s — its absence proves the
+    // no-op path (sameFeedSelection) was taken instead.
+    expect(scrollToSpy).not.toHaveBeenCalled()
+    expect(feedFilter.value).toEqual(['Feed A', 'Feed B'])
+  })
+
+  it('does not re-apply the filter when null is emitted while already unfiltered', async () => {
+    const { allItems } = useFeeds()
+    allItems.value = [
+      { id: 1, feedTitle: 'Feed A', title: 'a', url: 'https://example.test/1', timestamp: '2026-01-01' },
+    ]
+
+    const wrapper = mountNav()
+    await flushPromises()
+    const scrollToSpy = vi.spyOn(window, 'scrollTo')
+
+    await wrapper.find('.app-nav__filter-btn').trigger('click')
+    wrapper.findComponent(FeedFilter).vm.$emit('close', null)
+    await flushPromises()
+
+    expect(scrollToSpy).not.toHaveBeenCalled()
+  })
+
+  it('returns focus to the filter button once the modal closes', async () => {
+    const { allItems } = useFeeds()
+    allItems.value = [
+      { id: 1, feedTitle: 'Feed A', title: 'a', url: 'https://example.test/1', timestamp: '2026-01-01' },
+    ]
+
+    const wrapper = mountNav({ attachTo: document.body, global: { plugins: [router] } })
+    await flushPromises()
+    const button = wrapper.find('.app-nav__filter-btn')
+
+    await button.trigger('click')
+    wrapper.findComponent(FeedFilter).vm.$emit('close', ['Feed A'])
+    await flushPromises()
+
+    expect(document.activeElement).toBe(button.element)
+  })
+
   describe('sync spinner', () => {
     it('does not render the spinner, and reserves no space for it, when idle', async () => {
       const wrapper = mountNav()
@@ -351,7 +449,7 @@ describe('AppNav', () => {
       const syncPromise = sync(true)
       await nextTick()
 
-      expect(wrapper.find('.app-nav__filter').exists()).toBe(false)
+      expect(wrapper.find('.app-nav__filter-btn').exists()).toBe(false)
       expect(wrapper.find('.app-nav__sync-spinner').exists()).toBe(true)
 
       axios.get.mockResolvedValueOnce({ data: { feeds: [] } })

vue/src/components/modal/FeedFilter.vue

@@ -0,0 +1,145 @@
+<script setup>
+import '@/assets/modal.css';
+import { ref, watch, onUnmounted, nextTick } from 'vue'
+
+const props = defineProps({
+  show: Boolean,
+  titles: { type: Array, default: () => [] },
+  counts: { type: Object, default: () => ({}) },
+  selected: { type: Array, default: null },
+})
+const emit = defineEmits(['close'])
+
+// Component-local draft: seeded from `selected` each time the modal opens
+// (including on initial mount if it's already open — see the `immediate`
+// watcher below) and only reported back (via `close`) once it's dismissed —
+// see AppNav.vue for how the emitted selection is applied.
+const draft = ref(null)
+const allFeedsCheckboxRef = ref(null)
+
+function isChecked(title) {
+  return draft.value !== null && draft.value.includes(title)
+}
+
+function onToggleAll(event) {
+  if (event.target.checked) {
+    draft.value = null
+  } else {
+    // The selection is never allowed to be empty — "All feeds" is the
+    // fallback state, so it can't be unchecked without checking a feed first.
+    event.target.checked = true
+  }
+}
+
+function onToggleFeed(title, checked) {
+  if (checked) {
+    draft.value = draft.value === null ? [title] : [...draft.value, title]
+  } else {
+    const remaining = (draft.value ?? []).filter(t => t !== title)
+    // Unchecking the last selected feed falls back to "All feeds" — see
+    // onToggleAll, the selection is never allowed to be empty.
+    draft.value = remaining.length > 0 ? remaining : null
+  }
+}
+
+function handleClose() {
+  emit('close', draft.value)
+}
+
+function onKeydown(event) {
+  if (event.key === 'Escape') handleClose()
+}
+
+// While the modal is open, scrolling the page behind it would run through
+// list view's IntersectionObserver and mark articles read out from under the
+// user — lock it, and restore whatever it was before. `''` is a legitimate
+// saved overflow value, so `isLocked` (not a null-check on the saved value)
+// tracks whether there's actually anything to restore — otherwise unlocking
+// on unmount without ever having locked would stomp a value this component
+// never touched.
+let previousBodyOverflow = ''
+let isLocked = false
+function lockBodyScroll() {
+  previousBodyOverflow = document.body.style.overflow
+  document.body.style.overflow = 'hidden'
+  isLocked = true
+}
+function unlockBodyScroll() {
+  if (!isLocked) return
+  document.body.style.overflow = previousBodyOverflow
+  isLocked = false
+}
+
+watch(() => props.show, async (isOpen) => {
+  if (isOpen) {
+    draft.value = props.selected ? [...props.selected] : null
+    lockBodyScroll()
+    window.addEventListener('keydown', onKeydown)
+    await nextTick()
+    allFeedsCheckboxRef.value?.focus()
+  } else {
+    unlockBodyScroll()
+    window.removeEventListener('keydown', onKeydown)
+  }
+}, { immediate: true })
+
+onUnmounted(() => {
+  unlockBodyScroll()
+  window.removeEventListener('keydown', onKeydown)
+})
+</script>
+
+<template>
+  <Transition name="modal">
+    <div v-if="show" class="modal-mask" @click.self="handleClose">
+      <div class="modal-container" role="dialog" aria-modal="true" aria-labelledby="feed-filter-heading">
+        <div class="modal-header">
+          <h3 id="feed-filter-heading">Filter feeds</h3>
+        </div>
+        <div class="modal-body">
+          <label class="feed-filter__option">
+            <input
+              ref="allFeedsCheckboxRef"
+              type="checkbox"
+              :checked="draft === null"
+              @change="onToggleAll"
+            />
+            All feeds
+          </label>
+          <label v-for="title in titles" :key="title" class="feed-filter__option">
+            <input
+              type="checkbox"
+              :checked="isChecked(title)"
+              @change="onToggleFeed(title, $event.target.checked)"
+            />
+            {{ title }} ({{ counts[title] ?? 0 }})
+          </label>
+        </div>
+        <div class="modal-footer">
+          <button type="button" @click="handleClose">Done</button>
+        </div>
+      </div>
+    </div>
+  </Transition>
+</template>
+
+<style scoped>
+.feed-filter__option {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  min-height: 44px;
+  cursor: pointer;
+}
+
+/* modal.css's global `input` rule (display: block, width: 100%, min-height:
+   44px, ...) is meant for the text inputs in AddUrl.vue's form — reset it
+   here so checkboxes don't render full-width and oversized. */
+.feed-filter__option input[type='checkbox'] {
+  display: inline-block;
+  width: auto;
+  min-height: 0;
+  margin: 0;
+  padding: 0;
+}
+</style>

vue/src/components/modal/__tests__/FeedFilter.spec.js

@@ -0,0 +1,246 @@
+import { describe, it, expect, afterEach } from 'vitest'
+import { mount } from '@vue/test-utils'
+import { nextTick } from 'vue'
+import FeedFilter from '../FeedFilter.vue'
+
+describe('FeedFilter', () => {
+  const previousBodyOverflow = document.body.style.overflow
+
+  afterEach(() => {
+    document.body.style.overflow = previousBodyOverflow
+  })
+
+  it('renders nothing when show is false', () => {
+    const wrapper = mount(FeedFilter, {
+      props: { show: false, titles: ['Feed A'], counts: { 'Feed A': 2 }, selected: null },
+    })
+
+    expect(wrapper.find('.modal-mask').exists()).toBe(false)
+  })
+
+  it('renders "All feeds" plus one checkbox per title, defaulting a missing count to 0', () => {
+    const wrapper = mount(FeedFilter, {
+      props: { show: true, titles: ['Feed A', 'Feed B'], counts: { 'Feed A': 2 }, selected: null },
+    })
+
+    const options = wrapper.findAll('.feed-filter__option')
+    expect(options).toHaveLength(3)
+    expect(options[0].text()).toBe('All feeds')
+    expect(options[1].text()).toBe('Feed A (2)')
+    expect(options[2].text()).toBe('Feed B (0)')
+  })
+
+  it('checks "All feeds" and leaves every feed unchecked (but enabled) when nothing is selected', () => {
+    const wrapper = mount(FeedFilter, {
+      props: { show: true, titles: ['Feed A', 'Feed B'], counts: {}, selected: null },
+    })
+
+    const checkboxes = wrapper.findAll('input[type="checkbox"]')
+    expect(checkboxes[0].element.checked).toBe(true)
+    expect(checkboxes[1].element.checked).toBe(false)
+    expect(checkboxes[1].element.disabled).toBe(false)
+    expect(checkboxes[2].element.checked).toBe(false)
+  })
+
+  it('checking a feed unchecks "All feeds"', async () => {
+    const wrapper = mount(FeedFilter, {
+      props: { show: true, titles: ['Feed A', 'Feed B'], counts: {}, selected: null },
+    })
+    const checkboxes = wrapper.findAll('input[type="checkbox"]')
+
+    await checkboxes[1].setValue(true)
+
+    expect(checkboxes[0].element.checked).toBe(false)
+    expect(checkboxes[1].element.checked).toBe(true)
+    expect(checkboxes[2].element.checked).toBe(false)
+  })
+
+  it('checking a second feed keeps both checked, with "All feeds" still unchecked', async () => {
+    const wrapper = mount(FeedFilter, {
+      props: { show: true, titles: ['Feed A', 'Feed B'], counts: {}, selected: ['Feed A'] },
+    })
+    const checkboxes = wrapper.findAll('input[type="checkbox"]')
+
+    await checkboxes[2].setValue(true)
+
+    expect(checkboxes[0].element.checked).toBe(false)
+    expect(checkboxes[1].element.checked).toBe(true)
+    expect(checkboxes[2].element.checked).toBe(true)
+  })
+
+  it('unchecking the last selected feed falls back to "All feeds"', async () => {
+    const wrapper = mount(FeedFilter, {
+      props: { show: true, titles: ['Feed A', 'Feed B'], counts: {}, selected: ['Feed A'] },
+    })
+    const checkboxes = wrapper.findAll('input[type="checkbox"]')
+
+    await checkboxes[1].setValue(false)
+
+    expect(checkboxes[0].element.checked).toBe(true)
+    expect(checkboxes[1].element.checked).toBe(false)
+  })
+
+  it('checking "All feeds" clears every selected feed', async () => {
+    const wrapper = mount(FeedFilter, {
+      props: { show: true, titles: ['Feed A'], counts: {}, selected: ['Feed A'] },
+    })
+    const checkboxes = wrapper.findAll('input[type="checkbox"]')
+    expect(checkboxes[0].element.checked).toBe(false)
+    expect(checkboxes[1].element.checked).toBe(true)
+
+    await checkboxes[0].setValue(true)
+
+    expect(checkboxes[0].element.checked).toBe(true)
+    expect(checkboxes[1].element.checked).toBe(false)
+  })
+
+  it('unchecking "All feeds" while it is active leaves it checked — the selection is never empty', async () => {
+    const wrapper = mount(FeedFilter, {
+      props: { show: true, titles: ['Feed A'], counts: {}, selected: null },
+    })
+    const allCheckbox = wrapper.findAll('input[type="checkbox"]')[0]
+
+    await allCheckbox.setValue(false)
+
+    expect(allCheckbox.element.checked).toBe(true)
+  })
+
+  it('emits close with the current draft when Done is clicked', async () => {
+    const wrapper = mount(FeedFilter, {
+      props: { show: true, titles: ['Feed A', 'Feed B'], counts: {}, selected: null },
+    })
+    await wrapper.findAll('input[type="checkbox"]')[1].setValue(true)
+
+    await wrapper.find('.modal-footer button').trigger('click')
+
+    expect(wrapper.emitted('close')).toEqual([[['Feed A']]])
+  })
+
+  it('emits close with the current draft on Escape, but not again once closed', async () => {
+    const wrapper = mount(FeedFilter, {
+      props: { show: false, titles: ['Feed A'], counts: {}, selected: null },
+    })
+    await wrapper.setProps({ show: true })
+
+    window.dispatchEvent(new KeyboardEvent('keydown', { key: 'Escape' }))
+    await nextTick()
+    expect(wrapper.emitted('close')).toEqual([[null]])
+
+    await wrapper.setProps({ show: false })
+    window.dispatchEvent(new KeyboardEvent('keydown', { key: 'Escape' }))
+    await nextTick()
+
+    expect(wrapper.emitted('close')).toHaveLength(1)
+  })
+
+  it('emits close on a backdrop click, but not on a click inside the modal container', async () => {
+    const wrapper = mount(FeedFilter, {
+      props: { show: true, titles: ['Feed A'], counts: {}, selected: null },
+    })
+
+    await wrapper.find('.modal-header').trigger('click')
+    expect(wrapper.emitted('close')).toBeUndefined()
+
+    await wrapper.find('.modal-mask').trigger('click')
+    expect(wrapper.emitted('close')).toEqual([[null]])
+  })
+
+  it('reseeds the draft from `selected` on reopen, discarding an abandoned edit', async () => {
+    const wrapper = mount(FeedFilter, {
+      props: { show: true, titles: ['Feed A', 'Feed B'], counts: {}, selected: ['Feed A'] },
+    })
+    // Edit the draft without confirming via Done/close.
+    await wrapper.findAll('input[type="checkbox"]')[2].setValue(true)
+    expect(wrapper.findAll('input[type="checkbox"]')[2].element.checked).toBe(true)
+
+    await wrapper.setProps({ show: false })
+    await wrapper.setProps({ show: true })
+    await nextTick()
+
+    const checkboxes = wrapper.findAll('input[type="checkbox"]')
+    expect(checkboxes[1].element.checked).toBe(true) // Feed A, from `selected`
+    expect(checkboxes[2].element.checked).toBe(false) // Feed B, abandoned edit dropped
+  })
+
+  it('locks body scroll while open and restores the prior value on close', async () => {
+    document.body.style.overflow = 'scroll'
+    const wrapper = mount(FeedFilter, {
+      props: { show: false, titles: [], counts: {}, selected: null },
+    })
+
+    await wrapper.setProps({ show: true })
+    expect(document.body.style.overflow).toBe('hidden')
+
+    await wrapper.setProps({ show: false })
+    expect(document.body.style.overflow).toBe('scroll')
+  })
+
+  it('restores the prior body scroll value on unmount while still open', async () => {
+    document.body.style.overflow = 'auto'
+    const wrapper = mount(FeedFilter, {
+      props: { show: false, titles: [], counts: {}, selected: null },
+    })
+
+    await wrapper.setProps({ show: true })
+    expect(document.body.style.overflow).toBe('hidden')
+
+    wrapper.unmount()
+    expect(document.body.style.overflow).toBe('auto')
+  })
+
+  it('focuses the "All feeds" checkbox after opening', async () => {
+    const wrapper = mount(FeedFilter, {
+      props: { show: false, titles: ['Feed A'], counts: {}, selected: null },
+      attachTo: document.body,
+    })
+
+    await wrapper.setProps({ show: true })
+    await nextTick()
+    await nextTick()
+
+    expect(document.activeElement).toBe(wrapper.findAll('input[type="checkbox"]')[0].element)
+
+    wrapper.unmount()
+  })
+
+  it('seeds the draft, locks body scroll, and wires Escape when mounted already open', async () => {
+    document.body.style.overflow = 'auto'
+    const wrapper = mount(FeedFilter, {
+      props: { show: true, titles: ['Feed A', 'Feed B'], counts: {}, selected: ['Feed A'] },
+    })
+    await nextTick()
+
+    expect(document.body.style.overflow).toBe('hidden')
+    const checkboxes = wrapper.findAll('input[type="checkbox"]')
+    expect(checkboxes[1].element.checked).toBe(true) // Feed A, seeded from `selected`
+
+    window.dispatchEvent(new KeyboardEvent('keydown', { key: 'Escape' }))
+    await nextTick()
+    expect(wrapper.emitted('close')).toEqual([[['Feed A']]])
+
+    wrapper.unmount()
+  })
+
+  it('leaves a pre-set body overflow untouched when mounted closed and then unmounted', () => {
+    document.body.style.overflow = 'scroll'
+    const wrapper = mount(FeedFilter, {
+      props: { show: false, titles: [], counts: {}, selected: null },
+    })
+
+    wrapper.unmount()
+
+    expect(document.body.style.overflow).toBe('scroll')
+  })
+
+  it('renders dialog accessibility attributes tied to the heading', () => {
+    const wrapper = mount(FeedFilter, {
+      props: { show: true, titles: ['Feed A'], counts: {}, selected: null },
+    })
+
+    const dialog = wrapper.find('.modal-container')
+    expect(dialog.attributes('role')).toBe('dialog')
+    expect(dialog.attributes('aria-modal')).toBe('true')
+    const labelledby = dialog.attributes('aria-labelledby')
+    expect(wrapper.find(`#${labelledby}`).text()).toBe('Filter feeds')
+  })
+})

vue/src/composables/__tests__/feedFilterBoot.spec.js

@@ -0,0 +1,85 @@
+// loadPersistedFeedFilter() (see useFeeds.js) reads localStorage at module
+// import time, not lazily — every case here has to vi.resetModules() and
+// dynamically re-import so the module-scope ref actually re-initializes
+// against the localStorage value set up beforehand. Mirrors the pattern in
+// viewModeBoot.spec.js.
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest'
+
+vi.mock('axios')
+
+class FakeIntersectionObserver {
+  observe() {}
+  unobserve() {}
+  disconnect() {}
+}
+vi.stubGlobal('IntersectionObserver', FakeIntersectionObserver)
+
+describe('feedFilter boot persistence', () => {
+  beforeEach(() => {
+    vi.resetModules()
+    localStorage.clear()
+  })
+
+  afterEach(() => {
+    localStorage.clear()
+  })
+
+  it('boots with the persisted array when it is valid', async () => {
+    localStorage.setItem('feedFilter', JSON.stringify(['Feed A', 'Feed B']))
+
+    const { useFeeds } = await import('../useFeeds')
+    const { feedFilter } = useFeeds()
+
+    expect(feedFilter.value).toEqual(['Feed A', 'Feed B'])
+  })
+
+  it('boots into "All feeds" when the key is absent', async () => {
+    const { useFeeds } = await import('../useFeeds')
+    const { feedFilter } = useFeeds()
+
+    expect(feedFilter.value).toBeNull()
+  })
+
+  it('boots into "All feeds" when the persisted array is empty', async () => {
+    localStorage.setItem('feedFilter', JSON.stringify([]))
+
+    const { useFeeds } = await import('../useFeeds')
+    const { feedFilter } = useFeeds()
+
+    expect(feedFilter.value).toBeNull()
+  })
+
+  it.each([
+    ['a plain object', JSON.stringify({ title: 'Feed A' })],
+    ['a bare string', JSON.stringify('Feed A')],
+  ])('boots into "All feeds" when the persisted value is not an array (%s)', async (_label, raw) => {
+    localStorage.setItem('feedFilter', raw)
+
+    const { useFeeds } = await import('../useFeeds')
+    const { feedFilter } = useFeeds()
+
+    expect(feedFilter.value).toBeNull()
+  })
+
+  it('boots into "All feeds" when the persisted value is not valid JSON', async () => {
+    localStorage.setItem('feedFilter', 'not json')
+
+    const { useFeeds } = await import('../useFeeds')
+    const { feedFilter } = useFeeds()
+
+    expect(feedFilter.value).toBeNull()
+  })
+
+  it.each([
+    ['numbers', [1]],
+    ['null', [null]],
+    ['a mix of strings and non-strings', ['a', 2]],
+  ])('boots into "All feeds" when the array contains non-string elements (%s)', async (_label, value) => {
+    localStorage.setItem('feedFilter', JSON.stringify(value))
+
+    const { useFeeds } = await import('../useFeeds')
+    const { feedFilter } = useFeeds()
+
+    expect(feedFilter.value).toBeNull()
+  })
+})

vue/src/composables/__tests__/useFeeds.spec.js

@@ -1,6 +1,6 @@
 import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest'
 import axios from 'axios'
-import { useFeeds } from '../useFeeds'
+import { useFeeds, logout, clearFeedFilter } from '../useFeeds'
 
 vi.mock('axios')
 
@@ -17,6 +17,7 @@ describe('useFeeds', () => {
   beforeEach(() => {
     localStorage.setItem('user-token', 'test-token')
     localStorage.setItem('user-id', '7')
+    localStorage.removeItem('feedFilter')
     vi.clearAllMocks()
 
     feeds.value = []
@@ -118,9 +119,9 @@ describe('useFeeds', () => {
     setInitialLoad(false)
   })
 
-  it('refreshes the filter dropdown\'s displayed per-feed counts when list-view scrolling marks an article read', async () => {
+  it('refreshes the filter modal\'s displayed per-feed counts when list-view scrolling marks an article read', async () => {
     // displayedFeedUnreadCounts is a frozen snapshot of feedUnreadCounts (see
-    // useFeeds.js) — AppNav's filter <select> renders it instead of the live
+    // useFeeds.js) — AppNav's filter modal renders it instead of the live
     // computed so paging through article view doesn't force it to repaint.
     // List-view scrolling is a different code path (handleIntersection) and
     // should keep it live regardless.
@@ -658,6 +659,31 @@ describe('useFeeds', () => {
       },
     }
 
+    const threeFeedsResponse = {
+      data: {
+        feeds: [
+          {
+            title: 'Feed A',
+            items: [
+              { id: 1, title: 'A1', content: '', url: 'https://example.test/a1', timestamp: '2026-01-01 10:00:00' },
+            ],
+          },
+          {
+            title: 'Feed B',
+            items: [
+              { id: 2, title: 'B1', content: '', url: 'https://example.test/b1', timestamp: '2026-01-02 10:00:00' },
+            ],
+          },
+          {
+            title: 'Feed C',
+            items: [
+              { id: 3, title: 'C1', content: '', url: 'https://example.test/c1', timestamp: '2026-01-03 10:00:00' },
+            ],
+          },
+        ],
+      },
+    }
+
     it('narrows the displayed list to a single feed and restores it on "All feeds"', async () => {
       axios.get.mockResolvedValueOnce(twoFeedsResponse)
       await fetchData()
@@ -667,7 +693,7 @@ describe('useFeeds', () => {
       // Unfiltered: everything, newest first (Jan 3, Jan 2, Jan 1).
       expect(feeds.value.map(f => f.id)).toEqual([3, 2, 1])
 
-      await setFeedFilter('Feed A')
+      await setFeedFilter(['Feed A'])
       expect(feeds.value.map(f => f.id)).toEqual([3, 1])
 
       await setFeedFilter(null)
@@ -679,7 +705,7 @@ describe('useFeeds', () => {
       axios.put.mockResolvedValue({ status: 200 })
       await fetchData()
 
-      await setFeedFilter('Feed A')
+      await setFeedFilter(['Feed A'])
       setInitialLoad(true)
 
       // The first Feed A article scrolls above the viewport → marked read and
@@ -701,7 +727,7 @@ describe('useFeeds', () => {
       axios.put.mockResolvedValue({ status: 200 })
       await fetchData()
 
-      await setFeedFilter('Feed B')
+      await setFeedFilter(['Feed B'])
       expect(feeds.value.map(f => f.id)).toEqual([2])
 
       // Article view marks the displayed article read in place (feed.read =
@@ -712,8 +738,8 @@ describe('useFeeds', () => {
 
       // Switching to another feed and back must not resurrect it as if it
       // were still unread.
-      await setFeedFilter('Feed A')
-      await setFeedFilter('Feed B')
+      await setFeedFilter(['Feed A'])
+      await setFeedFilter(['Feed B'])
 
       expect(feeds.value).toEqual([])
     })
@@ -727,14 +753,14 @@ describe('useFeeds', () => {
       // Switching into Feed B while in article view immediately displays its
       // one article's full content — that counts as "viewed", so it's marked
       // read the same way toggleViewMode()/nextArticle()/prevArticle() do.
-      await setFeedFilter('Feed B')
+      await setFeedFilter(['Feed B'])
 
       expect(axios.put).toHaveBeenCalledWith('/api/v1/article/read/2', null, expect.anything())
       expect(feeds.value[0].read).toBe(true)
 
       // It doesn't resurface either, once dropped on the next switch.
-      await setFeedFilter('Feed A')
-      await setFeedFilter('Feed B')
+      await setFeedFilter(['Feed A'])
+      await setFeedFilter(['Feed B'])
       expect(feeds.value).toEqual([])
     })
 
@@ -744,7 +770,7 @@ describe('useFeeds', () => {
 
       // List view only shows titles — switching filters there must not mark
       // anything read; that's still driven solely by scroll (handleIntersection).
-      await setFeedFilter('Feed B')
+      await setFeedFilter(['Feed B'])
 
       expect(axios.put).not.toHaveBeenCalled()
       expect(feeds.value[0].read).toBeUndefined()
@@ -755,7 +781,7 @@ describe('useFeeds', () => {
       axios.put.mockResolvedValue({ status: 200 })
       await fetchData()
 
-      await setFeedFilter('Feed B')
+      await setFeedFilter(['Feed B'])
       expect(feeds.value.map(f => f.id)).toEqual([2])
 
       // Mark all (visible = just Feed B) read — Feed B has no unread items left.
@@ -763,10 +789,10 @@ describe('useFeeds', () => {
       await markAllRead()
 
       // The list empties, but the filter stays put and the feed remains a
-      // selectable option (so the <select> never dangles) even though it no
+      // selectable option (so a checked feed never dangles) even though it no
       // longer has unread items.
       expect(feeds.value).toEqual([])
-      expect(feedFilter.value).toBe('Feed B')
+      expect(feedFilter.value).toEqual(['Feed B'])
       expect(feedTitles.value).toEqual(['Feed A', 'Feed B'])
 
       // Switching away drops the now-empty feed from the options.
@@ -783,9 +809,9 @@ describe('useFeeds', () => {
       expect(unreadCount.value).toBe(3)
 
       // Filtered: only the selected feed's unread items.
-      await setFeedFilter('Feed B')
+      await setFeedFilter(['Feed B'])
       expect(unreadCount.value).toBe(1)
-      await setFeedFilter('Feed A')
+      await setFeedFilter(['Feed A'])
       expect(unreadCount.value).toBe(2)
 
       await setFeedFilter(null)
@@ -803,6 +829,325 @@ describe('useFeeds', () => {
       allItems.value.find(i => i.id === 3).read = true
       expect(feedUnreadCounts.value).toEqual({ 'Feed A': 1, 'Feed B': 1 })
     })
+
+    it('filters the displayed list and unread count to the union of several selected feeds', async () => {
+      axios.get.mockResolvedValueOnce(threeFeedsResponse)
+      await fetchData()
+
+      await setFeedFilter(['Feed A', 'Feed C'])
+
+      // Newest first, Feed B (id 2) excluded.
+      expect(feeds.value.map(f => f.id)).toEqual([3, 1])
+      expect(unreadCount.value).toBe(2)
+    })
+
+    it('keeps every selected feed listed (even at 0 unread) once all of them are emptied', async () => {
+      axios.get.mockResolvedValueOnce(threeFeedsResponse)
+      axios.put.mockResolvedValue({ status: 200 })
+      await fetchData()
+
+      await setFeedFilter(['Feed A', 'Feed C'])
+      vi.spyOn(window, 'confirm').mockReturnValue(true)
+      await markAllRead()
+
+      expect(feeds.value).toEqual([])
+      expect(feedFilter.value).toEqual(['Feed A', 'Feed C'])
+      // Feed B is still present because it still has an unread item; A and C
+      // stay present purely because they're selected — see feedTitles.
+      expect(feedTitles.value).toEqual(['Feed A', 'Feed B', 'Feed C'])
+    })
+
+    it('limits mark-all-read to the selected feeds, leaving the rest untouched', async () => {
+      axios.get.mockResolvedValueOnce(threeFeedsResponse)
+      axios.put.mockResolvedValue({ status: 200 })
+      await fetchData()
+
+      await setFeedFilter(['Feed A', 'Feed C'])
+      vi.spyOn(window, 'confirm').mockReturnValue(true)
+      await markAllRead()
+
+      expect(axios.put).toHaveBeenCalledWith('/api/v1/article/read/1', null, expect.anything())
+      expect(axios.put).toHaveBeenCalledWith('/api/v1/article/read/3', null, expect.anything())
+      expect(axios.put).not.toHaveBeenCalledWith('/api/v1/article/read/2', null, expect.anything())
+      // Feed B's unread item survives in the master untouched.
+      expect(allItems.value.map(f => f.id)).toEqual([2])
+    })
+
+    it('collapses an empty array selection to "All feeds" rather than an empty filter', async () => {
+      axios.get.mockResolvedValueOnce(twoFeedsResponse)
+      await fetchData()
+
+      await setFeedFilter(['Feed A'])
+      await setFeedFilter([])
+
+      expect(feedFilter.value).toBeNull()
+      expect(feeds.value.map(f => f.id)).toEqual([3, 2, 1])
+    })
+  })
+
+  describe('feed filter persistence', () => {
+    afterEach(() => {
+      localStorage.removeItem('feedFilter')
+    })
+
+    it('persists a feed selection to localStorage, and removes the key for "All feeds"', async () => {
+      await setFeedFilter(['Feed A', 'Feed B'])
+      expect(localStorage.getItem('feedFilter')).toBe(JSON.stringify(['Feed A', 'Feed B']))
+
+      await setFeedFilter(null)
+      expect(localStorage.getItem('feedFilter')).toBeNull()
+    })
+
+    it('clearFeedFilter resets the ref and removes the persisted key', async () => {
+      await setFeedFilter(['Feed A'])
+
+      clearFeedFilter()
+
+      expect(feedFilter.value).toBeNull()
+      expect(localStorage.getItem('feedFilter')).toBeNull()
+    })
+
+    it('logout clears the persisted feed filter along with the session', async () => {
+      axios.post.mockResolvedValueOnce({ status: 200 })
+      await setFeedFilter(['Feed A'])
+
+      await logout()
+
+      expect(feedFilter.value).toBeNull()
+      expect(localStorage.getItem('feedFilter')).toBeNull()
+    })
+  })
+
+  describe('pruneFeedFilter (via fetchData)', () => {
+    // pruneFeedFilter's own axios.get call is routed by URL, alongside
+    // fetchData's — vi.clearAllMocks() (see the outer beforeEach) clears call
+    // history but not a mockImplementation, so each test here resets it
+    // explicitly rather than leaking a stale router into later tests.
+    afterEach(() => {
+      axios.get.mockReset()
+    })
+
+    function mockArticleAndFeedsGets({ articleFeeds, filterFeeds, filterFeedsRejects }) {
+      axios.get.mockImplementation((url) => {
+        if (url.startsWith('/api/v1/article/get/')) {
+          return Promise.resolve({ data: { feeds: articleFeeds } })
+        }
+        if (url.startsWith('/api/v1/article/feeds/')) {
+          if (filterFeedsRejects) return Promise.reject(filterFeedsRejects)
+          return Promise.resolve({ data: { feeds: filterFeeds } })
+        }
+        return Promise.reject(new Error('unexpected axios.get url: ' + url))
+      })
+    }
+
+    async function flushMicrotasks(times = 10) {
+      for (let i = 0; i < times; i++) await Promise.resolve()
+    }
+
+    it('does not request the feeds endpoint when no filter is active', async () => {
+      feedFilter.value = null
+      mockArticleAndFeedsGets({ articleFeeds: [] })
+
+      await fetchData()
+
+      expect(axios.get).toHaveBeenCalledTimes(1)
+      expect(axios.get).toHaveBeenCalledWith('/api/v1/article/get/7', expect.anything())
+    })
+
+    it('drops a selected title whose feed no longer exists, keeping the one that does', async () => {
+      feedFilter.value = ['Feed A', 'Gone']
+      mockArticleAndFeedsGets({
+        articleFeeds: [
+          { title: 'Feed A', items: [{ id: 1, title: 'A1', content: '', url: 'https://example.test/a1', timestamp: '2026-01-01 10:00:00' }] },
+          { title: 'Feed B', items: [{ id: 2, title: 'B1', content: '', url: 'https://example.test/b1', timestamp: '2026-01-02 10:00:00' }] },
+        ],
+        filterFeeds: [{ title: 'Feed A' }],
+      })
+
+      await fetchData()
+
+      expect(axios.get).toHaveBeenCalledWith('/api/v1/article/feeds/7', expect.anything())
+      expect(feedFilter.value).toEqual(['Feed A'])
+      expect(localStorage.getItem('feedFilter')).toBe(JSON.stringify(['Feed A']))
+      expect(feeds.value.map(f => f.id)).toEqual([1])
+    })
+
+    it('collapses to "All feeds" when every selected title is gone', async () => {
+      feedFilter.value = ['Gone']
+      mockArticleAndFeedsGets({
+        articleFeeds: [
+          { title: 'Feed A', items: [{ id: 1, title: 'A1', content: '', url: 'https://example.test/a1', timestamp: '2026-01-01 10:00:00' }] },
+        ],
+        filterFeeds: [{ title: 'Feed A' }],
+      })
+
+      await fetchData()
+
+      expect(feedFilter.value).toBeNull()
+      expect(localStorage.getItem('feedFilter')).toBeNull()
+      expect(feeds.value.map(f => f.id)).toEqual([1])
+    })
+
+    it('keeps a selected feed with 0 unread items selected, without re-persisting', async () => {
+      feedFilter.value = ['Feed A']
+      const setItemSpy = vi.spyOn(Storage.prototype, 'setItem')
+      mockArticleAndFeedsGets({
+        articleFeeds: [], // Feed A has no unread items right now
+        filterFeeds: [{ title: 'Feed A' }], // but the feed itself still exists
+      })
+
+      await fetchData()
+
+      expect(feedFilter.value).toEqual(['Feed A'])
+      expect(setItemSpy).not.toHaveBeenCalledWith('feedFilter', expect.anything())
+
+      setItemSpy.mockRestore()
+    })
+
+    it('leaves the filter untouched and surfaces no user-facing error when the feeds lookup fails', async () => {
+      feedFilter.value = ['Feed A']
+      localStorage.setItem('feedFilter', JSON.stringify(['Feed A']))
+      const consoleErrorSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+      mockArticleAndFeedsGets({
+        articleFeeds: [
+          { title: 'Feed A', items: [{ id: 1, title: 'A1', content: '', url: 'https://example.test/a1', timestamp: '2026-01-01 10:00:00' }] },
+        ],
+        filterFeedsRejects: new Error('network'),
+      })
+
+      await fetchData()
+
+      expect(feedFilter.value).toEqual(['Feed A'])
+      expect(localStorage.getItem('feedFilter')).toBe(JSON.stringify(['Feed A']))
+      expect(showMessage.value).toBe(false)
+      expect(message.value).toBe('')
+      expect(consoleErrorSpy).toHaveBeenCalled()
+
+      consoleErrorSpy.mockRestore()
+    })
+
+    it('does not request the feeds endpoint when the article fetch itself fails', async () => {
+      feedFilter.value = ['Feed A']
+      axios.get.mockImplementation((url) => {
+        if (url.startsWith('/api/v1/article/get/')) return Promise.reject(new Error('network'))
+        return Promise.reject(new Error('unexpected axios.get url: ' + url))
+      })
+
+      await fetchData()
+
+      expect(axios.get).toHaveBeenCalledTimes(1)
+    })
+
+    it('does not resurrect the filter if it was cleared while the feeds lookup was still in flight', async () => {
+      feedFilter.value = ['Feed A']
+      const consoleErrorSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+      let resolveFeeds
+      axios.get.mockImplementation((url) => {
+        if (url.startsWith('/api/v1/article/get/')) {
+          return Promise.resolve({
+            data: { feeds: [{ title: 'Feed A', items: [{ id: 1, title: 'A1', content: '', url: 'https://example.test/a1', timestamp: '2026-01-01 10:00:00' }] }] },
+          })
+        }
+        if (url.startsWith('/api/v1/article/feeds/')) {
+          return new Promise(resolve => { resolveFeeds = resolve })
+        }
+        return Promise.reject(new Error('unexpected axios.get url: ' + url))
+      })
+
+      const fetchPromise = fetchData()
+      await flushMicrotasks() // let fetchData's own GET resolve and pruneFeedFilter dispatch its GET
+
+      clearFeedFilter()
+      resolveFeeds({ data: { feeds: [{ title: 'Feed A' }] } })
+      await fetchPromise
+
+      expect(feedFilter.value).toBeNull()
+      expect(consoleErrorSpy).not.toHaveBeenCalled()
+
+      consoleErrorSpy.mockRestore()
+    })
+
+    it('keeps a filter selected mid-request rather than reverting it to the prune outcome', async () => {
+      feedFilter.value = ['Feed A']
+      let resolveFeeds
+      axios.get.mockImplementation((url) => {
+        if (url.startsWith('/api/v1/article/get/')) {
+          return Promise.resolve({
+            data: {
+              feeds: [
+                { title: 'Feed A', items: [{ id: 1, title: 'A1', content: '', url: 'https://example.test/a1', timestamp: '2026-01-01 10:00:00' }] },
+                { title: 'Feed B', items: [{ id: 2, title: 'B1', content: '', url: 'https://example.test/b1', timestamp: '2026-01-02 10:00:00' }] },
+              ],
+            },
+          })
+        }
+        if (url.startsWith('/api/v1/article/feeds/')) {
+          return new Promise(resolve => { resolveFeeds = resolve })
+        }
+        return Promise.reject(new Error('unexpected axios.get url: ' + url))
+      })
+
+      const fetchPromise = fetchData()
+      await flushMicrotasks()
+
+      await setFeedFilter(['Feed B'])
+      // The (stale, already-in-flight) feeds list still includes Feed B, so the
+      // switch survives the prune that resolves afterwards.
+      resolveFeeds({ data: { feeds: [{ title: 'Feed A' }, { title: 'Feed B' }] } })
+      await fetchPromise
+
+      expect(feedFilter.value).toEqual(['Feed B'])
+    })
+
+    it('keeps isSyncing true until the feed-filter prune settles, not just the initial fetch', async () => {
+      feedFilter.value = ['Feed A']
+      let resolveFeeds
+      axios.get.mockImplementation((url) => {
+        if (url.startsWith('/api/v1/article/get/')) {
+          return Promise.resolve({ data: { feeds: [{ title: 'Feed A', items: [] }] } })
+        }
+        if (url.startsWith('/api/v1/article/feeds/')) {
+          return new Promise(resolve => { resolveFeeds = resolve })
+        }
+        return Promise.reject(new Error('unexpected axios.get url: ' + url))
+      })
+
+      const fetchPromise = fetchData()
+      await flushMicrotasks()
+
+      expect(isSyncing.value).toBe(true)
+
+      resolveFeeds({ data: { feeds: [{ title: 'Feed A' }] } })
+      await fetchPromise
+
+      expect(isSyncing.value).toBe(false)
+    })
+  })
+
+  describe('setFeedFilter no-op guard', () => {
+    it('no-ops on an empty array while already unfiltered', async () => {
+      feedFilter.value = null
+      const scrollToSpy = vi.spyOn(window, 'scrollTo')
+
+      await setFeedFilter([])
+
+      expect(scrollToSpy).not.toHaveBeenCalled()
+      expect(feedFilter.value).toBeNull()
+
+      scrollToSpy.mockRestore()
+    })
+
+    it('does not mark anything read on a no-op call while in article view', async () => {
+      feedFilter.value = ['Feed A']
+      viewMode.value = 'article'
+      feeds.value = [{ id: 1, feedTitle: 'Feed A', title: 'a' }]
+
+      await setFeedFilter(['Feed A'])
+
+      expect(axios.put).not.toHaveBeenCalled()
+
+      viewMode.value = 'list'
+    })
   })
 
   it('strips leftover embedded-video placeholder headings', async () => {

vue/src/composables/useFeeds.js

@@ -12,18 +12,38 @@ const showMessage = ref(false)
 // the index-based observer / currentIndex logic has to know a filter exists.
 const allItems = ref([]);
 const feeds = ref([]);
-const feedFilter = ref(null) // selected feedTitle, or null = all feeds (not persisted)
-// Distinct feed titles present in the loaded (unread) items — the filter options.
-// The active filter is always kept in the list even once its feed runs out of
-// unread items, so the <select> never binds to a value that isn't an option
-// (it just shows "All caught up") and the feed stays re-selectable.
+// Selected feed titles, or null = all feeds. Persisted in localStorage (see
+// setFeedFilter) so the selection survives a reload.
+function loadPersistedFeedFilter() {
+  const raw = localStorage.getItem('feedFilter')
+  if (!raw) return null
+  try {
+    const parsed = JSON.parse(raw)
+    return Array.isArray(parsed) && parsed.length > 0 && parsed.every(title => typeof title === 'string') ? parsed : null
+  } catch {
+    return null
+  }
+}
+const feedFilter = ref(loadPersistedFeedFilter())
+// Feed titles are specific to the account that was logged in — call this
+// wherever a session ends (explicit logout, or a 401 dropping a stale/expired
+// one in main.js) so they can't leak (in storage or in the still-live module
+// singleton) into whichever account is active next on this device.
+export function clearFeedFilter() {
+  localStorage.removeItem('feedFilter')
+  feedFilter.value = null
+}
+// Distinct feed titles present in the loaded (unread) items — the filter
+// checkbox options. Every currently selected title is always kept in the
+// list even once its feed runs out of unread items, so a checked feed never
+// disappears out from under the user before they get a chance to uncheck it.
 const feedTitles = computed(() => {
   const titles = new Set(allItems.value.map(i => i.feedTitle))
-  if (feedFilter.value) titles.add(feedFilter.value)
+  for (const title of feedFilter.value ?? []) titles.add(title)
   return [...titles].sort((a, b) => a.localeCompare(b))
 })
-// Unread count per feed title, shown next to each option in the filter
-// <select>. Derived from the master (allItems) so article view's
+// Unread count per feed title, shown next to each checkbox in the filter
+// modal. Derived from the master (allItems) so article view's
 // read-but-still-shown items are excluded. A title kept in feedTitles with no
 // unread items left has no key here — render it as 0.
 const feedUnreadCounts = computed(() => {
@@ -38,13 +58,12 @@ const feedUnreadCounts = computed(() => {
 // rather than the displayed `feeds` so article view's read-but-still-shown
 // items are excluded and the count matches the filter regardless of view.
 const unreadCount = computed(() => {
-  const items = feedFilter.value
-    ? allItems.value.filter(i => i.feedTitle === feedFilter.value)
-    : allItems.value
-  return items.filter(i => !i.read).length
+  if (!feedFilter.value) return allItems.value.filter(i => !i.read).length
+  const titles = new Set(feedFilter.value)
+  return allItems.value.filter(i => !i.read && titles.has(i.feedTitle)).length
 })
 // AppNav renders this snapshot (refreshed via refreshUnreadDisplay, below)
-// for the filter <select>'s per-feed option counts, instead of binding
+// for the filter modal's per-feed checkbox counts, instead of binding
 // feedUnreadCounts directly — by design, this stays frozen while paging
 // through article view (markCurrentArticleRead marks one article read per
 // page turn, which would otherwise recompute it live on every single swipe).
@@ -163,6 +182,7 @@ export async function logout() {
   }
   localStorage.removeItem('user-token')
   localStorage.removeItem('user-id')
+  clearFeedFilter()
 }
 
 // Some feeds (e.g. Deutsche Welle) ship <img> tags whose `src` and various
@@ -364,9 +384,12 @@ async function markRead(id) {
 // feed with no remaining unread items projects to an empty list ("All caught
 // up") while staying selected — see feedTitles.
 function applyFilter() {
-  feeds.value = feedFilter.value
-    ? allItems.value.filter(i => i.feedTitle === feedFilter.value)
-    : allItems.value.slice()
+  if (!feedFilter.value) {
+    feeds.value = allItems.value.slice()
+    return
+  }
+  const titles = new Set(feedFilter.value)
+  feeds.value = allItems.value.filter(i => titles.has(i.feedTitle))
 }
 
 // Article view marks an article read in place (feed.read = true) without
@@ -385,16 +408,42 @@ function dropReadArticles() {
   allItems.value = allItems.value.filter(feed => !feed.read)
 }
 
+// Order-insensitive: callers building the next selection from checkbox
+// toggles (see FeedFilter.vue) can produce an array in a different order than
+// what's already active — that's not a real change.
+function sameFeedSelection(a, b) {
+  if (a === null || b === null) return a === b
+  if (a.length !== b.length) return false
+  const setA = new Set(a)
+  return b.every(title => setA.has(title))
+}
+
+// Shared by setFeedFilter() and pruneFeedFilter() — both assign feedFilter.value
+// then need the same localStorage write/removal to keep it in sync.
+function persistFeedFilter() {
+  if (feedFilter.value) {
+    localStorage.setItem('feedFilter', JSON.stringify(feedFilter.value))
+  } else {
+    localStorage.removeItem('feedFilter')
+  }
+}
+
 // Changes the active feed filter and re-projects. Mirrors toggleLayout's
 // observer/scroll-safe pattern: disconnect first, scroll to top, then re-point
 // the observer at the new .observe nodes after Vue has re-rendered. Works in
 // article view too — there are no .observe nodes there so the setup is a no-op,
 // and resetting currentIndex keeps paging valid against the new list.
-async function setFeedFilter(title) {
+// A no-op (order-insensitively unchanged) selection returns early, before any
+// of the scrollTo/dropReadArticles/mark-read side effects below — every
+// caller gets this protection for free rather than having to check first.
+async function setFeedFilter(titles) {
+  const next = titles && titles.length > 0 ? titles : null // null for "All feeds"
+  if (sameFeedSelection(feedFilter.value, next)) return
   disconnectObserver()
   window.scrollTo(0, 0)
   dropReadArticles()
-  feedFilter.value = title // null for "All feeds"
+  feedFilter.value = next
+  persistFeedFilter()
   currentIndex.value = 0
   applyFilter()
   // In article view the item at currentIndex is fully displayed, not just
@@ -408,6 +457,34 @@ async function setFeedFilter(title) {
   setupIntersectionObserver()
 }
 
+// A persisted/selected title can outlive its feed (deleted or renamed from
+// Admin) — the modal then has no way to un-list a title the user never got a
+// chance to see and uncheck. `allItems` can't tell "the feed still exists"
+// from "the feed has 0 unread items right now" (feedTitles deliberately keeps
+// the latter listed), so it's not a usable source of truth here; the feed
+// list itself is, and AdminFeeds.vue already fetches exactly that from this
+// same endpoint. Only requested when a filter is actually active, since
+// that's the only case with anything to prune.
+async function pruneFeedFilter() {
+  if (!feedFilter.value) return
+  try {
+    const user_id = localStorage.getItem("user-id")
+    const response = await axios.get("/api/v1/article/feeds/" + user_id, authHeaders())
+    // The filter may have been cleared (logout / 401) while the request was in flight.
+    if (!feedFilter.value) return
+    const existingTitles = new Set(response.data.feeds.map(feed => feed.title))
+    const pruned = feedFilter.value.filter(title => existingTitles.has(title))
+    if (pruned.length === feedFilter.value.length) return
+    feedFilter.value = pruned.length > 0 ? pruned : null
+    persistFeedFilter()
+    applyFilter()
+  } catch (error) {
+    // Best-effort: a stale title stuck in the modal until the next successful
+    // prune is harmless, so don't fail the reload over it.
+    console.error('Error pruning feed filter', error)
+  }
+}
+
 const fetchData = async () => {
   try {
     beginSync()
@@ -435,6 +512,7 @@ const fetchData = async () => {
     freshItems.sort((a, b) => b.timestamp.localeCompare(a.timestamp));
     allItems.value = freshItems;
     applyFilter();
+    await pruneFeedFilter();
     refreshUnreadDisplay();
     await nextTick();
     setupIntersectionObserver();

vue/src/httpAuthInterceptor.js

@@ -0,0 +1,23 @@
+import router from './router'
+import { clearFeedFilter } from './composables/useFeeds'
+
+// Extracted out of main.js so it's unit-testable in isolation: importing
+// main.js itself boots the whole app (createApp(...).mount('#app')) and
+// eagerly touches the router's lazy-loaded route components, neither of
+// which a test can do safely.
+//
+// A 401 means the server has rejected the token (missing, expired, or
+// revoked via logout/token_version bump elsewhere). Drop the stale session
+// and send the user back to login rather than leaving them on a page where
+// every request silently fails.
+export function handleUnauthorizedResponse(error) {
+  if (error.response?.status === 401) {
+    localStorage.removeItem('user-token')
+    localStorage.removeItem('user-id')
+    clearFeedFilter()
+    if (router.currentRoute.value.name !== 'login') {
+      router.push({ name: 'login' })
+    }
+  }
+  return Promise.reject(error)
+}

vue/src/main.js

@@ -4,23 +4,11 @@ import axios from 'axios'
 import { createApp } from 'vue'
 import App from './App.vue'
 import router from './router'
+import { handleUnauthorizedResponse } from './httpAuthInterceptor'
 
-// A 401 means the server has rejected the token (missing, expired, or
-// revoked via logout/token_version bump elsewhere). Drop the stale session
-// and send the user back to login rather than leaving them on a page where
-// every request silently fails.
 axios.interceptors.response.use(
   (response) => response,
-  (error) => {
-    if (error.response?.status === 401) {
-      localStorage.removeItem('user-token')
-      localStorage.removeItem('user-id')
-      if (router.currentRoute.value.name !== 'login') {
-        router.push({ name: 'login' })
-      }
-    }
-    return Promise.reject(error)
-  }
+  handleUnauthorizedResponse
 )
 
 const app = createApp(App)