Initial commit: Music Hub collaboration platform

Full-stack music production collaboration tool with:
- SvelteKit frontend with Design System (CSS vars, 8 shared components)
- Hono API with auth, projects, tracks, versions, comments
- PostgreSQL + Drizzle ORM (8 tables, roles, permissions)
- S3-compatible storage with presigned upload URLs
- wavesurfer.js audio player with waveform visualization
- A/B version comparison with synchronized playback
- Timestamped comments with threading and resolve workflow
- Magic Link authentication with Resend email integration
- Background audio processing (ffmpeg transcode + waveform peaks)
- Role-based access control (Owner, Engineers, Artist, Label, Management, Viewer)
- Toast notifications, skeleton loading, responsive layout
- Docker deployment setup (API + Web + Postgres)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/web/src/lib/stores/auth.ts

@@ -0,0 +1,38 @@
+import { writable } from 'svelte/store';
+import { api } from '$lib/api/client.js';
+
+type User = {
+  id: string;
+  email: string;
+  name: string;
+  avatarUrl?: string;
+} | null;
+
+export const user = writable<User>(null);
+export const authLoading = writable(true);
+
+export async function checkAuth() {
+  try {
+    const res = await api.get<{ user: User }>('/auth/me', true);
+    user.set(res.user);
+  } catch {
+    user.set(null);
+  } finally {
+    authLoading.set(false);
+  }
+}
+
+export async function sendMagicLink(email: string) {
+  return api.post('/auth/magic-link', { email });
+}
+
+export async function verifyToken(token: string) {
+  const res = await api.post<{ user: User }>('/auth/verify', { token });
+  user.set(res.user);
+  return res.user;
+}
+
+export async function logout() {
+  await api.post('/auth/logout');
+  user.set(null);
+}