refactor: simplify comments, styling, and conflict-resolution control flow

- replace stale plan-reference comments with intent-describing ones
- move inline nav style to a .site-nav CSS class
- drop dummy placeholder return in generate-key resolveConflict

app/actions/generate-key.js

@@ -76,8 +76,10 @@ export async function generateKey() {
  * Resolve a reserve() conflict: existing active key, reclaimable stale pending,
  * or an in-progress request.
  *
+ * Returns either a fresh reservation id to mint against, or a terminal result.
+ *
  * @param {{ githubUserId: string, githubUsername: string }} identity
- * @returns {Promise<{ reclaimedId?: string, result: GenerateKeyResult }>}
+ * @returns {Promise<{ reclaimedId?: string, result?: GenerateKeyResult }>}
  */
 async function resolveConflict(identity) {
   const row = await repo.findByGithubUserId(identity.githubUserId);
@@ -88,7 +90,7 @@ async function resolveConflict(identity) {
   if (row && isStale(row.created_at, STALE_PENDING_MS)) {
     await repo.deletePending(row.id);
     const retryId = await repo.reserve(identity.githubUserId, identity.githubUsername);
-    if (retryId) return { reclaimedId: retryId, result: { status: "error" } };
+    if (retryId) return { reclaimedId: retryId };
   }
   return {
     result: { status: "error", message: "A key request is already in progress. Try again shortly." },

app/globals.css

@@ -52,6 +52,12 @@ header.site-header {
   color: var(--text);
 }
 
+.site-nav {
+  display: flex;
+  align-items: center;
+  gap: 1rem;
+}
+
 .panel {
   background: var(--panel);
   border: 1px solid var(--border);

app/layout.js

@@ -9,7 +9,7 @@ export const metadata = {
 };
 
 /**
- * Root layout. The session-aware header is added in Phase 3.
+ * Root layout wrapping every page with the session-aware site header.
  *
  * @param {{ children: React.ReactNode }} props
  */

components/site-header.js

@@ -23,7 +23,7 @@ export async function SiteHeader() {
       <Link href="/" className="brand">
         llmapikey
       </Link>
-      <nav style={{ display: "flex", gap: "1rem", alignItems: "center" }}>
+      <nav className="site-nav">
         <Link href="/docs">Docs</Link>
         {username ? (
           <>

lib/supabase/server-client.js

@@ -5,8 +5,8 @@ import { cookies } from "next/headers";
 
 /**
  * Cookie-based Supabase client (anon key) for reading/refreshing the auth
- * session on the server. Use this to know WHO the request is (Phase 3 identity),
- * never to touch `api_keys` — that table lives in the unexposed `llmapikey`
+ * session on the server. Use this to know WHO the request is, never to touch
+ * `api_keys` — that table lives in the unexposed `llmapikey`
  * schema and is reached only via the direct Postgres client (lib/db).
  *
  * In Server Components cookie writes throw; we swallow that — session refresh