feat(chat): add SvelteKit web app with full feature parity to mobile

Web app features:
- Auth: Login, Register, Forgot Password with shared-auth-ui
- Chat: New chat, conversation view, message list, model selector
- Templates: List, create, edit, delete templates
- Spaces: Team workspaces with member management
- Documents: Document mode with version history
- Archive & Profile pages

Technical:
- SvelteKit 2 with Svelte 5 runes
- Tailwind CSS 4 with shared themes
- Supabase Auth with SSR
- ChatLogo added to shared-branding
- dev:*:app commands for web+backend

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

chat/apps/web/.env.example

@@ -0,0 +1,6 @@
+# Supabase Configuration (same as mobile app)
+PUBLIC_SUPABASE_URL=https://your-project.supabase.co
+PUBLIC_SUPABASE_ANON_KEY=your-supabase-anon-key
+
+# Chat Backend API
+PUBLIC_BACKEND_URL=http://localhost:3001