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/api/src/knowledge/services/graph.service.ts

@@ -104,8 +104,11 @@ export class GraphService {
 
       // Continue BFS if not at max depth
       if (depth < maxDepth) {
-        // Process outgoing links
+        // Process outgoing links (only resolved ones)
         for (const link of currentEntry.outgoingLinks) {
+          // Skip unresolved links
+          if (!link.targetId || !link.resolved) continue;
+
           // Add edge
           edges.push({
             id: link.id,
@@ -122,8 +125,11 @@ export class GraphService {
           }
         }
 
-        // Process incoming links
+        // Process incoming links (only resolved ones)
         for (const link of currentEntry.incomingLinks) {
+          // Skip unresolved links
+          if (!link.targetId || !link.resolved) continue;
+
           // Add edge
           const edgeExists = edges.some(
             (e) => e.sourceId === link.sourceId && e.targetId === link.targetId

apps/api/src/knowledge/services/link-resolution.service.ts

@@ -131,7 +131,9 @@ export class LinkResolutionService {
       return null;
     }
 
-    return fuzzyMatches[0].id;
+    // Return the single match
+    const match = fuzzyMatches[0];
+    return match ? match.id : null;
   }
 
   /**

apps/api/src/knowledge/services/link-sync.service.ts

@@ -1,7 +1,7 @@
 import { Injectable } from "@nestjs/common";
 import { PrismaService } from "../../prisma/prisma.service";
 import { LinkResolutionService } from "./link-resolution.service";
-import { parseWikiLinks, WikiLink } from "../utils/wiki-link-parser";
+import { parseWikiLinks } from "../utils/wiki-link-parser";
 
 /**
  * Represents a backlink to a knowledge entry