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/components/knowledge/EntryCard.tsx

@@ -61,7 +61,7 @@ export function EntryCard({ entry }: EntryCardProps) {
           {/* Tags */}
           {entry.tags && entry.tags.length > 0 && (
             <div className="flex flex-wrap gap-1.5 mb-3">
-              {entry.tags.map((tag) => (
+              {entry.tags.map((tag: { id: string; name: string; color: string | null }) => (
                 <span
                   key={tag.id}
                   className="inline-flex items-center px-2 py-0.5 rounded-full text-xs font-medium"
@@ -79,10 +79,12 @@ export function EntryCard({ entry }: EntryCardProps) {
           {/* Metadata row */}
           <div className="flex flex-wrap items-center gap-3 text-xs text-gray-500">
             {/* Status */}
-            <span className={`inline-flex items-center gap-1 px-2 py-1 rounded-full ${statusInfo.className}`}>
-              <span>{statusInfo.icon}</span>
-              <span>{statusInfo.label}</span>
-            </span>
+            {statusInfo && (
+              <span className={`inline-flex items-center gap-1 px-2 py-1 rounded-full ${statusInfo.className}`}>
+                <span>{statusInfo.icon}</span>
+                <span>{statusInfo.label}</span>
+              </span>
+            )}
 
             {/* Visibility */}
             <span className="inline-flex items-center gap-1">