dashboard-v2 frontend: node column + clickable pills on storage tabs

All storage rows now carry a 'node' field from the aggregator.
Adds a small green-pill component that renders the source node
name; click drills into that node's detail page.

Also fixes the TS interfaces to match the new backend shape
(node field added to Blob/Tag/Ref/Snapshot/RefTracking types).

dashboard-v2/src/lib/api.ts

@@ -22,23 +22,28 @@ export interface FleetSnapshot {
   nodes: NodeStatusV2[];
 }
 
+// Aggregator responses tag every row with the originating node.
 export interface BlobSummary {
+  node: string;
   blob_id_hex: string;
   size_bytes: number;
   chunk_count: number;
 }
 
 export interface TagSummary {
+  node: string;
   key: string;
   value_hex: string;
 }
 
 export interface RefSummary {
+  node: string;
   fingerprint_hex: string;
   blob_id_hex: string;
 }
 
 export interface SnapshotSummary {
+  node: string;
   name: string;
   created_at_unix: number;
   blob_count: number;
@@ -46,6 +51,7 @@ export interface SnapshotSummary {
 }
 
 export interface RefTrackingItem {
+  node: string;
   fingerprint_hex: string;
   repo: string;
   refs: string[];