Update submission_metadata queries

Enhance frontend to correctly fetch entity names by joining with submission_metadata and filtering metadata_key = 'name'; replace incorrect submission_metadata(name) usage in systemActivityService.ts and Profile.tsx with proper inner join and metadata_value extraction.

src/lib/systemActivityService.ts

@@ -368,7 +368,7 @@ export async function fetchSystemActivities(
   }
 
   // Fetch submission reviews (approved/rejected submissions)
-  // Note: Content is now in submission_metadata table, but entity_name is cached in view
+  // Note: Content is now in submission_metadata table - need to join and filter properly
   const { data: submissions, error: submissionsError } = await supabase
     .from('content_submissions')
     .select(`
@@ -377,8 +377,9 @@ export async function fetchSystemActivities(
       status, 
       reviewer_id, 
       reviewed_at,
-      submission_metadata(name)
+      submission_metadata!inner(metadata_value)
     `)
+    .eq('submission_metadata.metadata_key', 'name')
     .not('reviewed_at', 'is', null)
     .in('status', ['approved', 'rejected', 'partially_approved'])
     .order('reviewed_at', { ascending: false })
@@ -415,10 +416,10 @@ export async function fetchSystemActivities(
     );
 
     for (const submission of submissions) {
-      // Get name from submission_metadata
+      // Get name from submission_metadata - extract metadata_value from the joined result
       const metadata = submission.submission_metadata as any;
       const entityName = Array.isArray(metadata) && metadata.length > 0 
-        ? metadata[0]?.name 
+        ? metadata[0]?.metadata_value 
         : undefined;
       
       const submissionItem = itemsMap.get(submission.id);