chore: mark US-012 as complete and update progress log

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

prd.json

@@ -210,7 +210,7 @@
         "Verify in browser using dev-browser skill"
       ],
       "priority": 12,
-      "passes": false,
+      "passes": true,
       "notes": ""
     },
     {

progress.txt

@@ -172,3 +172,18 @@
   - Navbar has border-b styling with dark mode support for visual separation
   - Use gap-4 for spacing between navbar items (user email and logout button)
 ---
+
+## 2026-01-21 - US-012
+- What was implemented: Dashboard page listing user projects
+- Files changed:
+  - src/app/dashboard/page.tsx - new file with project listing, cards, and empty state
+- **Learnings for future iterations:**
+  - Dashboard page is a server component that fetches projects directly from Supabase
+  - Use .eq('user_id', user.id) for RLS-backed queries (though RLS also enforces this)
+  - Order by updated_at descending to show most recent projects first
+  - formatDate() helper with toLocaleDateString for human-readable dates
+  - Project cards use Link component for navigation to /editor/[projectId]
+  - Empty state uses dashed border (border-dashed) with centered content and icon
+  - Hover effects on cards: border-blue-300, shadow-md, and text color change on title
+  - Error state displayed if Supabase query fails
+---