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/pages/RefTrackingPage.tsx

@@ -63,6 +63,7 @@ export function RefTrackingPage() {
           <table className="w-full text-sm">
             <thead className="text-slate-500 uppercase text-xs tracking-wider">
               <tr>
+                <th className="text-left px-4 py-2 font-normal">node</th>
                 <th className="text-left px-4 py-2 font-normal">fingerprint</th>
                 <th className="text-left px-4 py-2 font-normal">refs</th>
                 <th className="text-left px-4 py-2 font-normal">first seen</th>
@@ -71,7 +72,12 @@ export function RefTrackingPage() {
             </thead>
             <tbody>
               {items.map((it) => (
-                <tr key={it.fingerprint_hex} className="border-t border-slate-900">
+                <tr key={it.node + ':' + it.fingerprint_hex} className="border-t border-slate-900">
+                  <td className="px-4 py-2">
+                    <span className="inline-block rounded bg-slate-800 text-emerald-300 text-xs font-mono px-2 py-0.5">
+                      {it.node}
+                    </span>
+                  </td>
                   <td className="px-4 py-2 font-mono text-xs">
                     {it.fingerprint_hex.slice(0, 24)}…
                   </td>