sync: ingestion improvements from private repo

- Fixed dimension auto-assignment (locked dimensions now properly assigned)
- Added description field as grounding context for AI
- Updated embedding format: Title → Description → Content → Dimensions
- Description-weighted search (5x boost)
- Bug fixes: extraction tool dimension display, DimensionSearchModal closing
- Removed quickLink tool (use Quick Link workflow instead)
- Added regenerate-description API endpoint

app/api/nodes/[id]/regenerate-description/route.ts

@@ -0,0 +1,58 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { nodeService } from '@/services/database';
+import { generateDescription } from '@/services/database/descriptionService';
+
+export const runtime = 'nodejs';
+
+export async function POST(
+  request: NextRequest,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  try {
+    const { id } = await params;
+    const nodeId = parseInt(id, 10);
+
+    if (isNaN(nodeId)) {
+      return NextResponse.json({
+        success: false,
+        error: 'Invalid node ID'
+      }, { status: 400 });
+    }
+
+    const node = await nodeService.getNodeById(nodeId);
+
+    if (!node) {
+      return NextResponse.json({
+        success: false,
+        error: 'Node not found'
+      }, { status: 404 });
+    }
+
+    // Generate new description using the description service
+    const newDescription = await generateDescription({
+      title: node.title,
+      content: node.content || undefined,
+      metadata: node.metadata as { source?: string; channel_name?: string; author?: string; site_name?: string } | undefined,
+      type: (node.metadata as { type?: string } | null)?.type
+    });
+
+    // Update the node with the new description
+    const updatedNode = await nodeService.updateNode(nodeId, {
+      description: newDescription
+    });
+
+    return NextResponse.json({
+      success: true,
+      node: updatedNode,
+      description: newDescription,
+      message: 'Description regenerated successfully'
+    });
+  } catch (error) {
+    console.error('Error regenerating description:', error);
+
+    return NextResponse.json({
+      success: false,
+      error: error instanceof Error ? error.message : 'Failed to regenerate description'
+    }, { status: 500 });
+  }
+}