Settings-dialog round 1 staging repair: the provider-rewiring files

Round 1 (27d4f33) listed sidebar.tsx, keyboard-shortcuts.tsx,
app/settings/page.tsx and the globals.css keyframes in its message but
they were never staged. This commits exactly that content: the sidebar
Settings row as a button calling the dialog provider, the mod+, chord
opening the dialog, /settings redirecting to /chat/new, and the
settings-pop keyframes (reduced-motion aware). No new changes —
catch-up staging only. (next-env.d.ts churn left untracked-in-commit as
dev-server noise.)

app/settings/page.tsx

@@ -1,8 +1,11 @@
-/** The settings route (thin settings wave): server shell over the client
- *  page — same shape as the chat routes (AppShell wraps via the root
- *  layout, so the sidebar + its Settings entry come along). */
-import { SettingsPage } from "@/components/settings/settings-page.tsx";
+import { redirect } from "next/navigation";
 
-export default function Page() {
-	return <SettingsPage />;
-}
+/**
+ * The settings surface graduated into a centered dialog over the app
+ * (settings-app wave, 2026-09-20 — owner decision: modal-only, no page).
+ * The URL stays routed but redirects: nothing should land on a dead
+ * page; the dialog opens via the sidebar row or mod+,.
+ */
+export default function SettingsPage() {
+	redirect("/chat/new");
+}