Clean up config: fix broken plugin specs, dedupe options/keymaps, drop dead code

- lspsaga: custom keys lived outside config(), so setup({}) ran empty and
  they never worked; moved into setup() and updated to the plugin's current
  option schema (finder_action_keys/definition_action_keys/move_in_saga
  are stale names in the installed version)
- catppuccin: fixed a stray `as = "catppuccin"` key left outside the plugin
  table; wrapped as { "catppuccin/nvim", name = "catppuccin" }
- options: consolidated the three competing sources (vimrc, init.lua,
  custom/options.lua) into custom/options.lua alone; hlsearch/wrap were
  silently landing opposite to what init.lua's own comments said, purely
  from require-order. custom/options.lua now loads first in the require
  chain since colorizer.lua and others need termguicolors set before their
  own setup() runs
- removed duplicate keymaps that were dead on arrival due to load order
  (<leader>rn, <leader>sf/sg/sh, jj, <leader>y, mapleader x3, manual
  C-h/j/k/l vs vim-tmux-navigator)
- removed dead code: smart_format, root_dir/fallback_root_dir, toggleterm's
  unused _LAZYGIT_TOGGLE/_NODE_TOGGLE/_PYTHON_TOGGLE globals, unused local
  cmp, stale commented blocks, lua/custom/startup.lua
- removed unused plugins: mini.icons, telescope-dap.nvim,
  startup-nvim/startup.nvim (malformed spec, never actually required),
  plus leftover ALE globals with no ALE plugin installed
- vim.loop.* -> vim.uv.*, vim.diagnostic.goto_prev/next ->
  vim.diagnostic.jump({count=...}) for 0.12.5
- guard vim.treesitter.start() at the top of init.lua: the system's
  bundled Lua highlight query is currently ahead of the available
  tree-sitter-lua grammar (a packaging skew, confirmed nvim-treesitter is
  fully up to date), which was throwing on every Lua buffer and taking
  omnifunc/foldexpr down with it; now falls back to regex highlighting
  with a single notify instead

Verified end-to-end against a real Neovim 0.12.5 headless instance with a
fresh plugin install: no load errors, lspsaga's custom keys now actually
apply, and the treesitter guard was confirmed against the real environment.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013jVh2Lhn386JAvjSFCHUhn

lua/custom/plugins/init.lua

@@ -22,29 +22,26 @@ return {
 
 	-- vs-code like icons for autocompletion
 	"onsails/lspkind.nvim",
-	"catppuccin/nvim",
-	as = "catppuccin",
-	{ "startup-nvim/startup.nvim", dependencies = "nvim-telescope/telescope.nvim", "nvim-lua/plenary.nvim" },
+	{ "catppuccin/nvim", name = "catppuccin" },
 
 	{
 		'nvimdev/lspsaga.nvim',
 		config = function()
-			require('lspsaga').setup({})
+			require('lspsaga').setup({
+				-- use enter to open file from the finder
+				finder = {
+					keys = { toggle_or_open = "<CR>" },
+				},
+				-- use enter to open file with definition preview
+				definition = {
+					keys = { edit = "<CR>" },
+				},
+			})
 		end,
 		dependencies = {
 			'nvim-treesitter/nvim-treesitter', -- optional
 			'nvim-tree/nvim-web-devicons',     -- optional
 		},
-
-		move_in_saga = { prev = "<C-k>", next = "<C-j>" },
-		-- use enter to open file with finder
-		finder_action_keys = {
-			open = "<CR>",
-		},
-		-- use enter to open file with definition preview
-		definition_action_keys = {
-			edit = "<CR>",
-		},
 	},
 
 	-- Debugger
@@ -60,7 +57,6 @@ return {
 		"theHamsta/nvim-dap-virtual-text",
 		dependencies = "mfussenegger/nvim-dap",
 	},
-	"nvim-telescope/telescope-dap.nvim",
 	-- autoclose parens, brackets, quotes, etc...
 	"windwp/nvim-autopairs",
 
@@ -102,8 +98,6 @@ return {
 		}
 	},
 
-	{ 'echasnovski/mini.icons',    version = false },
-
 	{
 		-- HTTP REST-Client Interface
 		'mistweaverco/kulala.nvim',