UI styling improvements: dashboard headers and navigation

- Restore blue PageHeader on Dashboard (/app-components)
- Update homepage (/) with subtle header design without blue bar
- Add uniform PageHeader styling to application edit page
- Fix Rapporten link on homepage to point to /reports overview
- Improve header descriptions spacing for better readability

backend/scripts/migrate-sqlite-to-postgres.ts

@@ -66,7 +66,8 @@ async function migrateCacheDatabase(pg: Pool) {
   const sqlite = new Database(SQLITE_CACHE_DB, { readonly: true });
 
   try {
-    // Migrate cached_objects
+    // Migrate cached_objects (LEGACY - only for migrating old data from deprecated schema)
+    // Note: New databases use the normalized schema (objects + attribute_values tables)
     const objects = sqlite.prepare('SELECT * FROM cached_objects').all() as any[];
     console.log(`  Migrating ${objects.length} cached objects...`);