fix: code quality and safety improvements

src/components/ContributionHeatmap.tsx

@@ -318,7 +318,7 @@
     commits.forEach((c) => {
       if (c.repo) reposSet.add(c.repo);
     });
-    return Array.from(reposSet).sort();
+    return Array.from(reposSet).sort((a, b) => a - b);
   }, [commits]);
 
   // Extract unique languages
@@ -329,7 +329,7 @@
         if (l.name) langsSet.add(l.name);
       });
     });
-    return Array.from(langsSet).sort();
+    return Array.from(langsSet).sort((a, b) => a - b);
   }, [reposData]);
 
   // Map each repo to its languages for quick lookup

src/hooks/useRealtimeSync.ts

@@ -97,7 +97,7 @@
 
     // Stabilise `events` so an inline array definition (e.g. `["INSERT", "DELETE"]`)
     // doesn't cause the effect to re-run on every render.
-    const eventsKey = [...events].sort().join(",");
+    const eventsKey = [...events].sort((a, b) => a - b).join(",");
 
     useEffect(() => {
         const supabase = getSupabaseClient();