feat(frontend): team-browsing GUI with pod view

Replace the single join form with a richer UI: team cards (members as
avatars, repo, description), a member picker, and a post-join PodView showing
pod members (you highlighted) plus a PodMan panel with a slot for live
intervention cards. Adds Avatar/TeamCard/PodView components.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/lib/teams.ts

@@ -6,6 +6,7 @@ export interface DemoTeam {
   id: string;
   name: string;
   repo: string;
+  description: string;
   members: string[];
 }
 
@@ -14,18 +15,25 @@ export const TEAMS: DemoTeam[] = [
     id: 'demo-pod',
     name: 'Demo Pod',
     repo: 'karti-ai/podman',
+    description: 'The full crew — used for the live demo.',
     members: ['Karti', 'Yahya', 'Ramis', 'Zander', 'Shakthi'],
   },
   {
     id: 'frontend-squad',
     name: 'Frontend Squad',
     repo: 'karti-ai/podman',
+    description: 'PWA, capture, and PodMan card UI.',
     members: ['Karti', 'Zander'],
   },
   {
     id: 'backend-squad',
     name: 'Backend Squad',
     repo: 'karti-ai/podman',
+    description: 'LiveKit agent, vision, collision detector.',
     members: ['Yahya', 'Ramis'],
   },
 ];
+
+export function teamById(id: string): DemoTeam {
+  return TEAMS.find((t) => t.id === id) ?? TEAMS[0]!;
+}