fix(phase-4): add Move to folder dropdown on DocumentCard hover

frontend/src/components/documents/DocumentCard.vue

@@ -33,17 +33,51 @@
         </div>
       </div>
 
-      <!-- Share button (hover-reveal) -->
+      <!-- Action buttons (hover-reveal) -->
-      <button
+      <div class="opacity-0 group-hover:opacity-100 transition-opacity flex items-center gap-1 shrink-0">
-        @click.stop="openShareModal"
+        <!-- Move to folder -->
-        aria-label="Share document"
+        <div class="relative">
-        class="opacity-0 group-hover:opacity-100 transition-opacity min-h-[44px] min-w-[44px] flex items-center justify-center p-2 rounded-md text-gray-400 hover:text-indigo-600 hover:bg-indigo-50 transition-colors shrink-0"
+          <button
-      >
+            @click.stop="toggleFolderPicker"
-        <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            aria-label="Move to folder"
-          <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
+            class="min-h-[44px] min-w-[44px] flex items-center justify-center p-2 rounded-md text-gray-400 hover:text-indigo-600 hover:bg-indigo-50 transition-colors"
-            d="M8.684 13.342C8.886 12.938 9 12.482 9 12c0-.482-.114-.938-.316-1.342m0 2.684a3 3 0 110-2.684m0 2.684l6.632 3.316m-6.632-6l6.632-3.316m0 0a3 3 0 105.367-2.684 3 3 0 00-5.367 2.684zm0 9.316a3 3 0 105.368 2.684 3 3 0 00-5.368-2.684z" />
+          >
-        </svg>
+            <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
-      </button>
+              <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
+                d="M3 7a2 2 0 012-2h4l2 2h8a2 2 0 012 2v8a2 2 0 01-2 2H5a2 2 0 01-2-2V7z" />
+            </svg>
+          </button>
+          <!-- Folder picker dropdown -->
+          <div
+            v-if="showFolderPicker"
+            class="absolute right-0 top-full mt-1 w-48 bg-white border border-gray-200 rounded-xl shadow-lg z-20 py-1"
+            @click.stop
+          >
+            <button
+              class="w-full text-left px-3 py-2 text-sm text-gray-600 hover:bg-gray-50"
+              @click.stop="moveToFolder(null)"
+            >Root (no folder)</button>
+            <button
+              v-for="folder in allFolders"
+              :key="folder.id"
+              class="w-full text-left px-3 py-2 text-sm text-gray-700 hover:bg-indigo-50 hover:text-indigo-600 truncate"
+              @click.stop="moveToFolder(folder.id)"
+            >{{ folder.name }}</button>
+            <p v-if="!allFolders.length" class="px-3 py-2 text-xs text-gray-400">No folders yet</p>
+          </div>
+        </div>
+        <!-- Share -->
+        <button
+          @click.stop="openShareModal"
+          aria-label="Share document"
+          class="min-h-[44px] min-w-[44px] flex items-center justify-center p-2 rounded-md text-gray-400 hover:text-indigo-600 hover:bg-indigo-50 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="M8.684 13.342C8.886 12.938 9 12.482 9 12c0-.482-.114-.938-.316-1.342m0 2.684a3 3 0 110-2.684m0 2.684l6.632 3.316m-6.632-6l6.632-3.316m0 0a3 3 0 105.367-2.684 3 3 0 00-5.367 2.684zm0 9.316a3 3 0 105.368 2.684 3 3 0 00-5.368-2.684z" />
+          </svg>
+        </button>
+      </div>
     </div>
 
     <!-- ShareModal -->
@@ -56,8 +90,10 @@
 </template>
 
 <script setup>
-import { ref } from 'vue'
+import { ref, computed, onMounted, onUnmounted } from 'vue'
 import { useTopicsStore } from '../../stores/topics.js'
+import { useFoldersStore } from '../../stores/folders.js'
+import { moveDocument } from '../../api/client.js'
 import TopicBadge from '../topics/TopicBadge.vue'
 import ShareModal from '../sharing/ShareModal.vue'
 
@@ -66,12 +102,36 @@ const props = defineProps({
 })
 
 const topicsStore = useTopicsStore()
+const foldersStore = useFoldersStore()
 const showShareModal = ref(false)
+const showFolderPicker = ref(false)
+
+const allFolders = computed(() => foldersStore.folders)
 
 function openShareModal() {
   showShareModal.value = true
 }
 
+function toggleFolderPicker() {
+  showFolderPicker.value = !showFolderPicker.value
+}
+
+function closeFolderPicker(e) {
+  showFolderPicker.value = false
+}
+
+onMounted(() => document.addEventListener('click', closeFolderPicker))
+onUnmounted(() => document.removeEventListener('click', closeFolderPicker))
+
+async function moveToFolder(folderId) {
+  showFolderPicker.value = false
+  try {
+    await moveDocument(props.doc.id, folderId)
+  } catch (e) {
+    console.error('Move failed:', e.message)
+  }
+}
+
 function topicColor(name) {
   return topicsStore.topics.find(t => t.name === name)?.color ?? '#6366f1'
 }