fix: code review cleanup - schema sync, type safety, null handling

- Sync KnowledgeLink schema with migration (add displayText, positionStart, positionEnd, resolved)
- Make targetId optional to support unresolved links
- Fix null handling in graph.service.ts (skip unresolved links)
- Add explicit types to frontend components (remove implicit any)
- Remove unused WikiLink import
- Add null-safe statusInfo check in EntryCard

apps/web/src/app/(authenticated)/knowledge/page.tsx

@@ -40,7 +40,7 @@ export default function KnowledgePage() {
     // Filter by tag
     if (selectedTag !== "all") {
       filtered = filtered.filter((entry) =>
-        entry.tags.some((tag) => tag.slug === selectedTag)
+        entry.tags.some((tag: { slug: string }) => tag.slug === selectedTag)
       );
     }
 
@@ -51,7 +51,7 @@ export default function KnowledgePage() {
         (entry) =>
           entry.title.toLowerCase().includes(query) ||
           entry.summary?.toLowerCase().includes(query) ||
-          entry.tags.some((tag) => tag.name.toLowerCase().includes(query))
+          entry.tags.some((tag: { name: string }) => tag.name.toLowerCase().includes(query))
       );
     }