feat: in webui add bucket favorites and direct-navigation to explorer

Users may have access to buckets that don't appear in their owned-bucket
list. Previously there was no way to reach those buckets from the explorer
without knowing and manually editing the URL.

This adds a "go to bucket by name" input to the buckets view. Typing a
name and pressing Enter (or clicking Open) navigates to the bucket if
the user has permissions to allow it.

To avoid re-typing bucket names on every visit, users can now save buckets
to a favorites panel that persists in localStorage. Favorites are keyed by
access key so different users sharing the same browser each see only their
own list. Any bucket in the owned list can be starred directly from its row.
Favorites chips are clickable with the same access check, and a hover ×
removes them. The panel hides itself automatically when the list is empty.

webui/web/explorer.html

@@ -192,14 +192,50 @@ under the License.
 
           <!-- Buckets Table (shown when no bucket selected) -->
           <div id="buckets-view">
-            <!-- Create Bucket Button (shown for admin/userplus) -->
-            <div id="bucket-actions" class="flex justify-end mb-4">
-              <button onclick="openCreateBucketDialog()" class="inline-flex items-center gap-2 px-4 py-2 bg-accent hover:bg-accent-600 text-white font-medium rounded-lg transition-colors">
-                <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
-                  <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 4v16m8-8H4"/>
-                </svg>
-                Create Bucket
-              </button>
+            <!-- Action bar: go-to-bucket input + favorites + create bucket -->
+            <div class="flex items-center justify-between mb-4 gap-4 flex-wrap">
+              <div class="flex items-center gap-2">
+                <input type="text" id="goto-bucket-input"
+                  class="px-3 py-2 border border-gray-200 rounded-lg text-sm focus:outline-none focus:border-accent w-56"
+                  placeholder="Enter bucket name..."
+                  onkeydown="if(event.key==='Enter') goToBucketByName()">
+                <button onclick="goToBucketByName()" class="inline-flex items-center gap-1.5 px-3 py-2 border border-gray-200 hover:bg-gray-50 text-charcoal text-sm font-medium rounded-lg transition-colors" title="Open bucket">
+                  <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M5 8h14M5 8a2 2 0 110-4h14a2 2 0 110 4M5 8v10a2 2 0 002 2h10a2 2 0 002-2V8m-9 4h4"/>
+                  </svg>
+                  Open
+                </button>
+                <button onclick="addInputBucketToFavorites()" class="inline-flex items-center gap-1.5 px-3 py-2 border border-gray-200 hover:bg-yellow-50 hover:border-yellow-300 text-charcoal-300 hover:text-yellow-600 text-sm font-medium rounded-lg transition-colors" title="Save bucket name to favorites">
+                  <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M11.049 2.927c.3-.921 1.603-.921 1.902 0l1.519 4.674a1 1 0 00.95.69h4.915c.969 0 1.371 1.24.588 1.81l-3.976 2.888a1 1 0 00-.363 1.118l1.518 4.674c.3.922-.755 1.688-1.538 1.118l-3.976-2.888a1 1 0 00-1.176 0l-3.976 2.888c-.783.57-1.838-.197-1.538-1.118l1.518-4.674a1 1 0 00-.363-1.118l-3.976-2.888c-.784-.57-.38-1.81.588-1.81h4.914a1 1 0 00.951-.69l1.519-4.674z"/>
+                  </svg>
+                  Favorite
+                </button>
+              </div>
+              <!-- Create Bucket Button (shown for admin/userplus) -->
+              <div id="bucket-actions">
+                <button onclick="openCreateBucketDialog()" class="inline-flex items-center gap-2 px-4 py-2 bg-accent hover:bg-accent-600 text-white font-medium rounded-lg transition-colors">
+                  <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 4v16m8-8H4"/>
+                  </svg>
+                  Create Bucket
+                </button>
+              </div>
+            </div>
+
+            <!-- Favorites Section -->
+            <div id="favorites-section" class="mb-4 hidden">
+              <div class="bg-white rounded-xl shadow-sm border border-yellow-100 p-4">
+                <div class="flex items-center gap-2 mb-3">
+                  <svg class="w-4 h-4 text-yellow-500" fill="currentColor" viewBox="0 0 24 24">
+                    <path d="M11.049 2.927c.3-.921 1.603-.921 1.902 0l1.519 4.674a1 1 0 00.95.69h4.915c.969 0 1.371 1.24.588 1.81l-3.976 2.888a1 1 0 00-.363 1.118l1.518 4.674c.3.922-.755 1.688-1.538 1.118l-3.976-2.888a1 1 0 00-1.176 0l-3.976 2.888c-.783.57-1.838-.197-1.538-1.118l1.518-4.674a1 1 0 00-.363-1.118l-3.976-2.888c-.784-.57-.38-1.81.588-1.81h4.914a1 1 0 00.951-.69l1.519-4.674z"/>
+                  </svg>
+                  <h3 class="text-sm font-semibold text-charcoal">Favorites</h3>
+                </div>
+                <div id="favorites-list" class="flex flex-wrap gap-2">
+                  <!-- Populated by JS -->
+                </div>
+              </div>
             </div>
             <div class="bg-white rounded-xl shadow-sm border border-gray-100">
               <div class="overflow-x-auto">
@@ -1225,11 +1261,14 @@ under the License.
         if (createdCol) createdCol.style.display = 'none';
       }
 
+      const favoritesSet = new Set(loadFavorites());
+
       bucketsList.forEach(bucket => {
         const name = bucket.name || bucket.Name;
         const creationDate = bucket.creationdate || bucket.CreationDate;
         const versioningStatus = bucketsVersioningCache[name] || '';
         const objectLockConfig = bucketsObjectLockCache[name] || { enabled: false };
+        const starred = favoritesSet.has(name);
         const row = document.createElement('tr');
         row.className = 'file-row border-b border-gray-50';
         row.innerHTML = `
@@ -1250,6 +1289,11 @@ under the License.
           ${hasAnyCreationDate ? `<td class="py-3 px-4 text-charcoal-300 text-sm">${creationDate ? new Date(creationDate).toLocaleDateString() : '-'}</td>` : ''}
           <td class="py-3 px-4 text-center">
             <div class="flex items-center justify-center gap-1">
+              <button onclick="event.stopPropagation(); toggleFavorite('${escapeHtml(name)}')" class="inline-flex items-center gap-1 px-2.5 py-1.5 text-xs ${starred ? 'text-yellow-500 hover:text-yellow-600' : 'text-charcoal-300 hover:text-yellow-500'} hover:bg-yellow-50 rounded transition-colors" title="${starred ? 'Remove from favorites' : 'Add to favorites'}">
+                <svg class="w-3.5 h-3.5" fill="${starred ? 'currentColor' : 'none'}" stroke="currentColor" viewBox="0 0 24 24">
+                  <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M11.049 2.927c.3-.921 1.603-.921 1.902 0l1.519 4.674a1 1 0 00.95.69h4.915c.969 0 1.371 1.24.588 1.81l-3.976 2.888a1 1 0 00-.363 1.118l1.518 4.674c.3.922-.755 1.688-1.538 1.118l-3.976-2.888a1 1 0 00-1.176 0l-3.976 2.888c-.783.57-1.838-.197-1.538-1.118l1.518-4.674a1 1 0 00-.363-1.118l-3.976-2.888c-.784-.57-.38-1.81.588-1.81h4.914a1 1 0 00.951-.69l1.519-4.674z"/>
+                </svg>
+              </button>
               <button onclick="event.stopPropagation(); openBucketInfoModal('${escapeHtml(name)}')" class="inline-flex items-center gap-1 px-2.5 py-1.5 text-xs text-charcoal-400 hover:text-charcoal hover:bg-gray-100 rounded transition-colors" title="Bucket info">
                 <svg class="w-3.5 h-3.5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                   <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M13 16h-1v-4h-1m1-4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z"/>
@@ -1332,6 +1376,7 @@ under the License.
       document.getElementById('search-container').classList.add('hidden');
       clearSearch();
       updateBreadcrumb();
+      renderFavoritesSection();
     }
 
     function showObjectsView() {
@@ -1349,6 +1394,128 @@ under the License.
       updateUrl();
     }
 
+    async function selectBucketChecked(name) {
+      try {
+        await api.listObjectsV2(name, '', '/', 1);
+      } catch (e) {
+        showToast(`Cannot access bucket "${name}": ${e.message}`, 'error');
+        return false;
+      }
+      selectBucket(name);
+      return true;
+    }
+
+    async function goToBucketByName() {
+      const input = document.getElementById('goto-bucket-input');
+      const name = input.value.trim();
+      if (!name) {
+        showToast('Enter a bucket name first', 'warning');
+        return;
+      }
+      const ok = await selectBucketChecked(name);
+      if (ok) input.value = '';
+    }
+
+    function addInputBucketToFavorites() {
+      const input = document.getElementById('goto-bucket-input');
+      const name = input.value.trim();
+      if (!name) {
+        showToast('Enter a bucket name first', 'warning');
+        return;
+      }
+      addToFavorites(name);
+    }
+
+    // ============================================
+    // Favorites Management
+    // ============================================
+
+    function getFavoritesStorageKey() {
+      const info = api.getCredentialsInfo();
+      const key = (info && info.accessKey) ? info.accessKey : 'default';
+      return `explorer_favorites_${key}`;
+    }
+
+    function loadFavorites() {
+      try {
+        const raw = localStorage.getItem(getFavoritesStorageKey());
+        if (raw) return JSON.parse(raw);
+      } catch (e) {
+        console.error('Error loading favorites:', e);
+      }
+      return [];
+    }
+
+    function saveFavorites(favorites) {
+      try {
+        localStorage.setItem(getFavoritesStorageKey(), JSON.stringify(favorites));
+      } catch (e) {
+        console.error('Error saving favorites:', e);
+      }
+    }
+
+    function isFavorite(name) {
+      return loadFavorites().includes(name);
+    }
+
+    function addToFavorites(name) {
+      const favs = loadFavorites();
+      if (favs.includes(name)) {
+        showToast(`"${name}" is already in favorites`, 'info');
+        return;
+      }
+      favs.push(name);
+      saveFavorites(favs);
+      renderFavoritesSection();
+      // Re-render bucket rows to update star icons
+      if (bucketsList.length > 0) renderBuckets();
+      showToast(`Added "${name}" to favorites`, 'success');
+    }
+
+    function removeFromFavorites(name) {
+      const favs = loadFavorites().filter(f => f !== name);
+      saveFavorites(favs);
+      renderFavoritesSection();
+      // Re-render bucket rows to update star icons
+      if (bucketsList.length > 0) renderBuckets();
+      showToast(`Removed "${name}" from favorites`, 'info');
+    }
+
+    function toggleFavorite(name) {
+      if (isFavorite(name)) {
+        removeFromFavorites(name);
+      } else {
+        addToFavorites(name);
+      }
+    }
+
+    function renderFavoritesSection() {
+      const section = document.getElementById('favorites-section');
+      const list = document.getElementById('favorites-list');
+      if (!section || !list) return;
+
+      const favs = loadFavorites();
+
+      if (favs.length === 0) {
+        section.classList.add('hidden');
+        return;
+      }
+
+      section.classList.remove('hidden');
+      list.innerHTML = favs.map(name => `
+        <div class="group inline-flex items-center gap-1 pl-3 pr-1.5 py-1.5 bg-yellow-50 border border-yellow-200 hover:border-yellow-300 rounded-lg transition-colors">
+          <button onclick="selectBucketChecked('${escapeHtml(name)}')" class="text-sm text-charcoal font-mono hover:text-accent transition-colors">
+            ${escapeHtml(name)}
+          </button>
+          <button onclick="removeFromFavorites('${escapeHtml(name)}')" class="ml-1 p-0.5 text-charcoal-300 hover:text-red-500 hover:bg-red-50 rounded transition-colors opacity-0 group-hover:opacity-100" title="Remove from favorites">
+            <svg class="w-3.5 h-3.5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+              <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12"/>
+            </svg>
+          </button>
+        </div>
+      `).join('');
+    }
+
     function refresh() {
       if (currentBucket) {
         loadObjects();