feat(fullscreen): add Duplicate option to file context menu

app/frontend/src/apps/AppStore.tsx

@@ -46,7 +46,7 @@ function AppsTab() {
       if (!cancelled && catalog) setRemote(catalog.apps)
     })
 
-    Promise.all([loadBundled, loadRemote]).finally(() => {
+    void Promise.all([loadBundled, loadRemote]).finally(() => {
       if (!cancelled) setLoading(false)
     })
 
@@ -269,7 +269,7 @@ function ThemesTab({ activeTheme, onApplyTheme }: ThemesTabProps) {
   const [remoteThemes, setRemoteThemes] = useState<RemoteThemeEntry[]>([])
 
   useEffect(() => {
-    fetchRemoteCatalog().then(catalog => {
+    void fetchRemoteCatalog().then(catalog => {
       if (catalog?.themes) setRemoteThemes(catalog.themes)
     })
   }, [])

app/frontend/src/apps/remoteRegistry.ts

@@ -28,7 +28,7 @@ export interface RemoteAppEntry {
   description: string
   author: string
   version: string
-  category: 'productivity' | 'development' | 'utilities' | string
+  category: string
   repo: string
   official: boolean
   bundleUrl: string

app/frontend/src/fullscreen/FileExplorer.tsx

@@ -255,6 +255,30 @@ export default function FileExplorer({ root, selectedPath, onSelect, onRefresh,
     onRefresh()
   }, [newItem, onRefresh, loadDir])
 
+  const handleDuplicate = useCallback(async (node: FileNode) => {
+    const dir = parentDir(node.path)
+    const siblings = dirCache.get(dir) ?? []
+    const existingNames = new Set(siblings.map(n => n.name))
+
+    const dotIdx = node.name.lastIndexOf('.')
+    const hasDot = dotIdx > 0
+    const base = hasDot ? node.name.slice(0, dotIdx) : node.name
+    const ext  = hasDot ? node.name.slice(dotIdx)    : ''
+
+    let copyName = `${base} copy${ext}`
+    if (existingNames.has(copyName)) {
+      let n = 2
+      while (existingNames.has(`${base} copy ${n}${ext}`)) n++
+      copyName = `${base} copy ${n}${ext}`
+    }
+
+    const destPath = `${dir}/${copyName}`
+    await invoke('fs.copy', { from: node.path, to: destPath })
+    setRenaming(destPath)
+    setRenameVal(copyName)
+    void loadDir(dir)
+  }, [dirCache, loadDir])
+
   const handleCopyPath = useCallback((node: FileNode) => {
     void navigator.clipboard.writeText(node.path)
   }, [])
@@ -276,6 +300,9 @@ export default function FileExplorer({ root, selectedPath, onSelect, onRefresh,
       { label: 'Rename',     action: () => startRename(node) },
       { label: 'Copy Path',  action: () => handleCopyPath(node) },
     ]
+    if (!node.isDir) {
+      items.push({ label: 'Duplicate', action: () => { void handleDuplicate(node) } })
+    }
     // Apps contribute their own items here (e.g. Live Preview adds "Open Live
     // Preview" for .md/.html files) instead of the host hardcoding knowledge
     // of specific apps.
@@ -292,7 +319,7 @@ export default function FileExplorer({ root, selectedPath, onSelect, onRefresh,
     }
     items.push({ divider: true }, { label: 'Delete', danger: true, action: () => handleDelete(node) })
     return items
-  }, [handleNewFile, handleNewFolder, startRename, handleCopyPath, handleDelete, onAddToGitIgnore, installedApps])
+  }, [handleNewFile, handleNewFolder, startRename, handleCopyPath, handleDuplicate, handleDelete, onAddToGitIgnore, installedApps])
 
   // ── Empty-area context menu — acts on root dir ─────────────────────────────
   const buildAreaMenu = useCallback((node: FileNode): ContextMenuItem[] => [

cpp/src/fileops.cpp

@@ -249,6 +249,13 @@ bool make_dirs(const std::string& path) {
     return !ec;
 }
 
+bool copy_path(const std::string& from, const std::string& to) {
+    std::error_code ec;
+    fs::copy(from_u8(from), from_u8(to),
+             fs::copy_options::recursive | fs::copy_options::copy_symlinks, ec);
+    return !ec;
+}
+
 // ─── IPC dispatch ─────────────────────────────────────────────────────────────
 
 bool dispatch(const std::string& type, const json& msg,
@@ -304,6 +311,11 @@ bool dispatch(const std::string& type, const json& msg,
         reply({{"ok", make_dirs(msg.value("path", std::string{}))}});
         return true;
     }
+    if (type == "fs.copy") {
+        reply({{"ok", copy_path(msg.value("from", std::string{}),
+                                msg.value("to",   std::string{}))}});
+        return true;
+    }
     return false;
 }
 

cpp/src/fileops.hpp

@@ -31,6 +31,9 @@ bool create_file(const std::string& path);
 // Create directories recursively.
 bool make_dirs(const std::string& path);
 
+// Copy a file or directory tree to a new path.
+bool copy_path(const std::string& from, const std::string& to);
+
 // Monaco language ID — byte-for-byte match with Go's detectLanguage.
 std::string detect_language(const std::string& path);