The header's feed <select> is now a funnel button that opens a modal with
an "All feeds" checkbox and one checkbox per feed with unread items. The
selection is either "All feeds" or at least one feed, is applied once when
the modal closes, and is persisted in localStorage.
- feedFilter holds string[] | null; setFeedFilter is a no-op when the
selection is unchanged (order-insensitive), sparing callers the
scroll/mark-read side effects.
- Selected feeds stay listed at 0 unread so they can be unchecked; titles
whose feed no longer exists are pruned after each fetch.
- The persisted filter is cleared on logout and on 401 (handler extracted
to httpAuthInterceptor.js so it is unit-testable).
- The modal locks body scroll while open so scrolling behind it can't
mark articles read.
visibility:hidden still occupied the header's flex row, squeezing the
title on narrow screens and clipping the unread counter. Render the
spinner with v-if instead so it takes no space when not syncing.
activeSyncCount/isSyncing() in useFeeds.js already refcounted both boot
reload (fetchData) and manual sync() but wasn't reactive. Make it a ref
+ computed and expose it so AppNav can render a small spinner next to
the feed filter whenever a sync is in flight.
The spinner sits outside the filter's own v-if so it also shows during
a manual sync from pages other than /feeds, and its box is always
reserved (visibility toggle, not v-if) so the one-time --app-nav-height
measurement stays correct.
The Add RSS modal is now opened from a button directly above the feed
list in AdminFeeds.vue instead of the hamburger menu, so feed creation
lives alongside the rest of feed management. AppNav.vue no longer
renders it.
AddUrl.vue emits an `added` event on a successful save; AdminFeeds.vue
listens for it and reloads its feed list, so a newly added feed shows
up immediately without leaving the admin page.
Also fixes a bug this move surfaced: the modal's "Close" button had no
`type`, so inside the form it defaulted to type="submit" — clicking
Close on a filled-in form silently created the feed.
mathias