refactor(ui): every function compiles under the React Compiler but VirtualGrid, and react-hooks/refs is on

E32 S4 — the burn-down from 29 skipped functions to 1:

- try/finally (26 sites): the cleanup runs after a try/catch; steps that return early moved into
  their own function (push, the setup wizard's next, the share page's unlock).
- A conditional, loop or optional call inside a try skips the function too, and react-hooks/todo
  does not see it: the value is computed before the try, or the try lives in a module-level helper
  (config writes, clip queueing, clipboard, frame counts, seekable end, YouTube player times).
- The two exhaustive-deps suppressions are gone. useYtProgress takes its per-item snapshot through
  one effect event, read once when the player is built; PlexPlayer's unmount relies on the
  leaving-the-item cleanup for the generation bump it duplicated.
- What the skips hid: PlexPlayer's 17 render-phase ref writes (useLatest), its tracks popover alias,
  the loadSession self-reference (declared early, set after commit); PlayerModal's session-position
  read during render (now where the player starts), navRef/modeRef writes, and a description helper
  that ran a ref-carrying callback during render (now PlayerDescription); SavedViewsProvider's
  latest-cfg ref, and its setState in the seed effect (preferSticky now prefers the starred default
  among same-filter views, so the seed needs no sticky write — test seen red on the old helper).
- A store's hook was called `use()`, which the compiler does not know as a hook: inside the newly
  compiled usePlaylistActions it was memoized, ran on the first render alone, and the playlist rail
  threw "rendered fewer hooks" on its second render. Renamed to `useValue()` everywhere; the old
  contract test claimed the call was safe inside any `use…` function, which was false — replaced by
  a render test that is red under the old name.
- PlexPlayer's palette ref was written and never read since the Backspace guard moved to the layer
  stack: removed.

react-hooks/refs is back at error with no exception. The ratchet lists only VirtualGrid
(IncompatibleLibrary) and pins both players as compiled. No size or complexity ceiling was raised.

frontend/src/lib/keymap.ts

@@ -416,7 +416,7 @@ const tokens: { scope: KeyScope }[] = [];
 
 /** The live scopes, innermost first, always ending in `global`. Re-renders on change. */
 export function useActiveScopes(): KeyScope[] {
-  const stack = scopeStack.use();
+  const stack = scopeStack.useValue();
   // DEDUPED: a scope can be registered by more than one live component (the Playlists page and its
   // rail each mount a `useContextMenu`), and `helpLines` appends a row's chords once per occurrence —
   // so without this the sheet rendered "⇧ F10 Menu ⇧ F10 Menu" under a duplicated React key
@@ -449,14 +449,14 @@ export const toggleKeyboardHelp = (): void => {
   helpOpen.set(next);
 };
 /** Subscribe to whether the sheet is showing (the Plex player suppresses wheel-volume under it). */
-export const useKeyboardHelpOpen = (): boolean => helpOpen.use();
+export const useKeyboardHelpOpen = (): boolean => helpOpen.useValue();
 /** Whether the sheet was opened over a keyboard-owning layer (see `helpOverLayer`). */
-export const useKeyboardHelpOverLayer = (): boolean => helpOverLayer.use();
+export const useKeyboardHelpOverLayer = (): boolean => helpOverLayer.useValue();
 
 // The modules this account can reach — published by `useGlobalKeymap`, read by the `g` chords and
 // by the sheet (which drops the chord of a gated module rather than promise a page that isn't there).
 const navigablePages = createStore<readonly Page[]>([]);
-export const useNavigablePages = (): readonly Page[] => navigablePages.use();
+export const useNavigablePages = (): readonly Page[] => navigablePages.useValue();
 
 // ── The command palette ───────────────────────────────────────────────────────────────────────
 const paletteOpen = createStore(false);
@@ -464,7 +464,7 @@ const paletteOpen = createStore(false);
 export const closePalette = (): void => paletteOpen.set(false);
 /** Open it from a visible control (the header's key cap / launcher), not only from Ctrl/Cmd+K. */
 export const openPalette = (): void => paletteOpen.set(true);
-export const usePaletteOpen = (): boolean => paletteOpen.use();
+export const usePaletteOpen = (): boolean => paletteOpen.useValue();
 
 /** Bind the `global` and `page` scopes, once, for the whole app. It lives here rather than inside
  *  either overlay because both are opened by it: a listener that sat in one of them would have to
@@ -576,7 +576,7 @@ export function useSearchFocusKey(input: RefObject<HTMLInputElement | null>): vo
   }, [input]);
 }
 
-export const useHelpConditionValues = (): HelpConditions => helpConditions.use();
+export const useHelpConditionValues = (): HelpConditions => helpConditions.useValue();
 
 // ── Display ───────────────────────────────────────────────────────────────────────────────────
 const GLYPHS: Record<string, string> = {