refactor: component files export only components; lint fails on a warning

The 43 react-refresh/only-export-components warnings the gate let through meant an edit to a
provider (or AnchoredPopover, Toaster, plexDetailUi, …) could not be hot-swapped: Fast Refresh
reloads a module that also exports hooks or helpers.

- Each provider's contexts, the types its hooks return and the hooks themselves live in a sibling
  context module (navigationContext.ts, channelsContext.ts, …); the provider file keeps the
  component. loadAccountFilters moved next to the feed filters' defaults (feedFiltersInit.ts),
  following navigationInit/playlistsInit.
- Helpers that sat in component files have their own modules: welcomeMode, downloadTitle,
  plexPlayable, channelSync, ui/anchoredPopoverHooks, ui/pageToolbarSlot, ui/pagerContent,
  ui/toastLevels, ui/overlayOrder, ui/tableAlign, lib/plexDetail; the cells of the channel columns
  and the registry's page wrappers are components files of their own (channelCells, modulePages).
- usePersistedTab, an alias of useAccountPersistedState, is gone; its callers use the original.

npm run lint is now eslint --max-warnings 0, so a warning fails the gate like an error does.

frontend/src/components/PlexSidebar.tsx

@@ -17,8 +17,8 @@ import FilterChipGroup from "./ui/FilterChipGroup";
 import Combobox, { type ComboboxOption } from "./ui/Combobox";
 import SavedViewsPopover from "./SavedViewsPopover";
 import PersonalViewsModal from "./PersonalViewsModal";
-import { useSavedViews } from "./SavedViewsProvider";
-import { usePlex, usePlexActions } from "./PlexProvider";
+import { useSavedViews } from "./savedViewsContext";
+import { usePlex, usePlexActions } from "./plexContext";
 import { useMe } from "../lib/useMe";
 
 // The Plex module's left filter column — now the shared floating SidePanel with its filter groups