File manager: selection, keyboard shortcuts, rename modal, security, localization
- Selection model: click=select, dblclick=open, Ctrl+click toggle,
Shift+click range select, Ctrl+A, Esc to clear
- Keyboard shortcuts: Enter, Ctrl+Enter, F2, Backspace (navigate up),
Delete/Backspace (delete with confirm)
- Rename modal replaces prompt() with validation via backend ValidateName
- Context menu: Open, Open External, Show in Folder, Rename, Duplicate,
Copy, Cut, Delete — all with SVG icons and Russian labels
- Backend security: vaultPath/absPathSafe helpers prevent path traversal,
validateName rejects .. / \ null bytes empty overlong names
- MoveNode auto-renames on name conflict (copy style)
- Duplicate uses (copy) (copy 2) suffix pattern
- Russian localization: all file type labels, preview messages, tooltips
- FilePreviewModal: fixed broken {/if} tag