feat(e24): reach the Home surface — the landing toggle, a palette command, Shift+W

S4's reachability half. Home already led the nav order; what was missing was every
way IN other than the rail.

- Settings → Appearance → Startup: "Start on Home", the documented escape hatch for
  the landing override. Deliberately still localStorage and not a server pref —
  `loadInitialPage` answers before /api/me lands, and a landing module decided after
  the first paint is a visible jump. Its two stored values are now ONE exported
  constant, so the writer and the boot-time reader cannot drift on a magic string.
- The command palette gets "Meglepetés" / "Surprise me": it navigates to Home and
  rerolls the hero on arrival. No second "Mit nézzek?" row beside it — the Home
  module row already matches that phrase through its descriptive title.
- A global Shift+W jumps to Home. A chord, not a bare `w`: the Plex player binds bare
  letters and `w` sits on `s`, so a blind reach for the subtitle key would have thrown
  a viewer out of the film.

The palette's request crosses a lazy module boundary, so it is a token that waits
(lib/homeIntent) rather than an event fired into an empty room. Browser-measured:
taken with a compare-and-clear, because StrictMode's double-invoked mount effect
otherwise rerolled twice and landed on the page two picks deep.

HU/EN parity kept; UAT on localdev in both languages, including the empty shelf.

frontend/src/App.tsx

@@ -137,10 +137,11 @@ export default function App() {
     refetchInterval: (query) => (query.state.data ? 60_000 : false),
   });
 
-  // The `global` key scope: `h` opens the cheat sheet, Mod+K the jump-to palette. Bound only once
-  // signed in, because that is where both overlays are mounted (bottom of this tree) — see
-  // useGlobalKeymap on why binding it above the signed-out branch is worse than not binding it.
-  useGlobalKeymap(!!meQuery.data);
+  // The `global` key scope: `h` opens the cheat sheet, Mod+K the jump-to palette, Shift+W jumps to
+  // Home ("mit nézzek?"). Bound only once signed in, because that is where the overlays are mounted
+  // (bottom of this tree) and where the modules exist at all — see useGlobalKeymap on why binding it
+  // above the signed-out branch is worse than not binding it.
+  useGlobalKeymap(!!meQuery.data, () => setPage("home"));
 
   // Pin this tab to whatever account it first loaded as. Without this, a tab that never picked
   // an account (it was riding the session's default) would silently swap identity when ANOTHER