feat(10-11): teleport DocumentCard folder picker to body with getBoundingClientRect positioning

- Add pickerTriggerEl ref and pickerStyle computed from getBoundingClientRect
- Wrap folder picker dropdown in Teleport to body with data-test attribute
- Add updatePickerPosition() called on toggle, scroll, and resize
- Add window scroll/resize listeners with cleanup in onUnmounted
- 2 DocumentCard dropdown tests now pass

frontend/src/components/documents/DocumentCard.vue

@@ -62,6 +62,7 @@
         <!-- Move to folder -->
         <div class="relative">
           <button
+            ref="pickerTriggerEl"
             @click.stop="toggleFolderPicker"
             aria-label="Move to folder"
             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"
@@ -71,24 +72,6 @@
                 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
@@ -112,6 +95,30 @@
       @unshared="doc.is_shared = false"
     />
   </div>
+
+  <!-- Teleported folder picker — avoids overflow:hidden clipping -->
+  <Teleport to="body">
+    <div
+      v-if="showFolderPicker"
+      :style="pickerStyle"
+      data-test="folder-picker"
+      class="fixed z-[9999] bg-white border border-gray-200 rounded-xl shadow-lg overflow-y-auto py-1"
+      style="max-height: 240px;"
+      @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>
+  </Teleport>
 </template>
 
 <script setup>
@@ -134,6 +141,8 @@ const foldersStore = useFoldersStore()
 const showShareModal = ref(false)
 const showFolderPicker = ref(false)
 const reanalyzing = ref(false)
+const pickerTriggerEl = ref(null)
+const pickerStyle = ref({})
 
 const allFolders = computed(() => foldersStore.rootFolders)
 
@@ -141,16 +150,58 @@ function openShareModal() {
   showShareModal.value = true
 }
 
+function updatePickerPosition() {
+  if (!pickerTriggerEl.value) return
+  const rect = pickerTriggerEl.value.getBoundingClientRect()
+  const spaceBelow = window.innerHeight - rect.bottom
+  const dropH = 240
+  if (spaceBelow >= dropH || spaceBelow > 120) {
+    pickerStyle.value = {
+      top: `${rect.bottom + 4}px`,
+      left: `${rect.left}px`,
+      width: '192px',
+    }
+  } else {
+    pickerStyle.value = {
+      bottom: `${window.innerHeight - rect.top + 4}px`,
+      left: `${rect.left}px`,
+      width: '192px',
+    }
+  }
+}
+
 function toggleFolderPicker() {
-  showFolderPicker.value = !showFolderPicker.value
+  if (showFolderPicker.value) {
+    showFolderPicker.value = false
+  } else {
+    updatePickerPosition()
+    showFolderPicker.value = true
+  }
+}
+
+function onScroll() {
+  if (showFolderPicker.value) updatePickerPosition()
 }
 
 function closeFolderPicker(e) {
+  if (
+    !e.target.closest('[data-test="folder-picker"]') &&
+    !e.target.closest('.relative')
+  ) {
     showFolderPicker.value = false
+  }
 }
 
-onMounted(() => document.addEventListener('click', closeFolderPicker))
-onUnmounted(() => document.removeEventListener('click', closeFolderPicker))
+onMounted(() => {
+  document.addEventListener('click', closeFolderPicker)
+  window.addEventListener('scroll', onScroll, true)
+  window.addEventListener('resize', onScroll)
+})
+onUnmounted(() => {
+  document.removeEventListener('click', closeFolderPicker)
+  window.removeEventListener('scroll', onScroll, true)
+  window.removeEventListener('resize', onScroll)
+})
 
 async function moveToFolder(folderId) {
   showFolderPicker.value = false