P0: Next.js shell — tokens, motion, SlidePanel, LeftRail, auth plumbing

- Tailwind v4 @theme block encoding all spec §2 tokens; full §3 keyframe
  inventory with prefers-reduced-motion handling; Geist vendored (air-gap)
- SlidePanel width-animation primitive (component-tested: exit-transition
  unmount, fixed-width inner content, a11y region semantics)
- session-key.ts mirroring the Rust codec + URL-param encoding; nuqs
  panel-params with spec ?sessions=1 flag shape and routines->scheduled alias
- Zod-typed API client; httpOnly cookie session bridge (/auth/session);
  login page; (workspace) layout with LeftRail roster/nav/user; Team and
  Credits pages on real endpoints (+ GET /api/team/members in tc-api)
- Vitest + Testing Library harness (26 tests); ESLint max-lines 1250 +
  no-warning-comments mirroring the CI gates

Co-Authored-By: Claude Fable 5 <[email protected]>

frontend/src/app/(workspace)/credits/page.tsx

@@ -0,0 +1,25 @@
+import { fetchCredits } from "@/lib/api/team";
+
+// Credits page (§8.4): available balance; purchase and usage land in P5.
+export default async function CreditsPage() {
+  const credits = await fetchCredits();
+  return (
+    <section className="mx-auto max-w-3xl px-8 py-12">
+      <h1 className="text-2xl font-semibold tracking-tight">Credits</h1>
+      <p className="pt-1 text-sm text-muted-foreground">
+        Manage balance, subscriptions, and usage
+      </p>
+      <div className="mt-8 rounded-(--radius) border border-border bg-surface-warm p-6 shadow-(--shadow-card)">
+        <p className="text-xs uppercase tracking-wide text-muted-foreground">
+          Available credits
+        </p>
+        <p className="pt-2 font-mono text-xxxl font-semibold">
+          {credits.available.toLocaleString("en-US")}
+        </p>
+        <p className="pt-2 text-xs text-muted-foreground">
+          All credits never expire.
+        </p>
+      </div>
+    </section>
+  );
+}