feat: inline rename on double-click in library asset cards

Double-clicking a clip name in the library shows an in-place text input.
Enter/blur commits the new display_name via PATCH; Escape cancels.
Clicking the card body or action buttons still work normally.

services/web-ui/public/index.html

@@ -257,6 +257,22 @@
       overflow: hidden;
       text-overflow: ellipsis;
       white-space: nowrap;
+      cursor: text;
+    }
+
+    /* Inline rename input */
+    .asset-name-input {
+      width: 100%;
+      font-size: var(--text-sm);
+      font-weight: 500;
+      font-family: inherit;
+      padding: 1px 4px;
+      border-radius: 3px;
+      border: 1px solid var(--accent-border);
+      background: var(--bg-raised);
+      color: var(--text-primary);
+      outline: none;
+      box-sizing: border-box;
     }
 
     .asset-info {
@@ -303,7 +319,7 @@
       min-width: 160px;
     }
 
-    /* Asset detail popover */
+    /* Asset action buttons */
     .asset-actions {
       position: absolute;
       top: var(--sp-2);
@@ -619,6 +635,7 @@
     setupDrag();
     setupSearch();
     setupFilters();
+    setupRenameListener(document.getElementById('assetGrid'));
 
     // Multi-select bulk actions
     if (window.SelectionManager) {
@@ -806,7 +823,7 @@
           </div>
         </div>
         <div class="asset-meta">
-          <div class="asset-name">${escHtml(asset.display_name || asset.filename)}</div>
+          <div class="asset-name" data-rename-id="${asset.id}" title="Double-click to rename">${escHtml(asset.display_name || asset.filename)}</div>
           <div class="asset-info">
             <span class="asset-type">${escHtml(asset.media_type || '')}</span>
             <span class="text-tertiary text-xs">${asset.file_size ? formatFileSize(asset.file_size) : ''}</span>
@@ -819,6 +836,7 @@
 
       card.addEventListener('click', (e) => {
         if (e.target.closest('.asset-action-btn')) return;
+        if (e.target.closest('.asset-name[data-rename-id]')) return; // let rename handle it
         if (window.openAssetPreview) window.openAssetPreview(asset.id);
       });
 
@@ -827,6 +845,61 @@
     if (window.SelectionManager) SelectionManager.refreshUI();
   }
 
+  // ── Inline rename ─────────────────────────
+  function setupRenameListener(grid) {
+    grid.addEventListener('dblclick', async e => {
+      const nameEl = e.target.closest('.asset-name[data-rename-id]');
+      if (!nameEl) return;
+      e.stopPropagation();
+
+      const assetId = nameEl.dataset.renameId;
+      const current = nameEl.textContent;
+
+      const input = document.createElement('input');
+      input.type = 'text';
+      input.value = current;
+      input.className = 'asset-name-input';
+      nameEl.style.display = 'none';
+      nameEl.parentNode.insertBefore(input, nameEl.nextSibling);
+      input.focus();
+      input.select();
+
+      let saved = false;
+
+      const save = async () => {
+        if (saved) return;
+        saved = true;
+        const newName = input.value.trim();
+        input.remove();
+        nameEl.style.display = '';
+        if (!newName || newName === current) return;
+        const r = await updateAsset(assetId, { display_name: newName });
+        if (r.success) {
+          nameEl.textContent = newName;
+          // Update state cache so re-renders don't revert
+          const a = state.assets.find(x => x.id === assetId);
+          if (a) a.display_name = newName;
+          toast('Renamed', newName, 'success');
+        } else {
+          toast('Rename failed', r.error, 'error');
+        }
+      };
+
+      const cancel = () => {
+        if (saved) return;
+        saved = true;
+        input.remove();
+        nameEl.style.display = '';
+      };
+
+      input.addEventListener('blur', save);
+      input.addEventListener('keydown', e => {
+        if (e.key === 'Enter')  { e.preventDefault(); input.blur(); }
+        if (e.key === 'Escape') { e.preventDefault(); cancel(); }
+      });
+    });
+  }
+
   function statusBadgeClass(s) {
     const map = { live:'badge-live', ingesting:'badge-ingesting', processing:'badge-processing', ready:'badge-ready', error:'badge-error', archived:'badge-archived' };
     return map[s] || 'badge-idle';