Redesign /jobs with sidebar filters and styled cards

Port the prod visual design: two-column layout with filter sidebar
(type, page size, 5 tag checkboxes), stylized cyan+pink wordmark hero,
and job cards with pink border, pill tags, reactions, and show-more
collapse. Add a `wide` prop to BaseLayout for the roomier page width.
Add a 5-minute in-process cache to discordIdentity to avoid Discord
API rate limits during development.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: vcarl

netlify/functions/discordIdentity.mts

@@ -1,9 +1,24 @@
 import type { Context } from "@netlify/functions";
 
+const CACHE_TTL_MS = 5 * 60 * 1000;
+const cache = new Map<
+  string,
+  { expiresAt: number; status: number; body: string }
+>();
+
 const handler = async (request: Request, context: Context) => {
   // Inexplicably `$ netlify dev` seems to hard crash if an `Authentication`
   // header is present on an incoming request. So, hack
   const Authorization = request.headers.get("x-auth")!;
+
+  const cached = cache.get(Authorization);
+  if (cached && cached.expiresAt > Date.now()) {
+    return new Response(cached.body, {
+      status: cached.status,
+      headers: { "Content-Type": "application/json", "x-cache": "HIT" },
+    });
+  }
+
   try {
     const [userRes, memberRes] = await Promise.all([
       fetch("https://discord.com/api/users/@me", {
@@ -33,15 +48,20 @@ const handler = async (request: Request, context: Context) => {
         );
       }
     }
-    return new Response(
-      JSON.stringify({
-        user,
-        isMember: memberRes.ok,
-      }),
-      {
-        headers: { "Content-Type": "application/json" },
-      },
-    );
+    const body = JSON.stringify({
+      user,
+      isMember: memberRes.ok,
+    });
+    if (userRes.ok) {
+      cache.set(Authorization, {
+        expiresAt: Date.now() + CACHE_TTL_MS,
+        status: 200,
+        body,
+      });
+    }
+    return new Response(body, {
+      headers: { "Content-Type": "application/json", "x-cache": "MISS" },
+    });
   } catch (e) {
     console.error("[DIS_ID]", e);
     return new Response(JSON.stringify(e), { status: 400 });