Removed individual delete, upload, hidden files, and refresh buttons.
Added a hamburger (☰) menu with:
- Select: toggles selection mode with checkboxes for multi-select
- Delete: enabled only when files are selected
- Upload: file upload
- Refresh: reload current directory
- Show Hidden Files: toggles dotfile visibility, persisted via localStorage
Toolbar now only has New File, New Folder, and the hamburger menu for a
cleaner interface.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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