Renamed every user-facing occurrence: the Files sub-tab label, the bucket
detail page's link button, the empty state, error subject, and the retention
copy. Internal naming (Trash/ folder, component names, hooks, query keys,
route path) is left as-is — only the displayed text changed.
Also updates the demo script and implementation notes to match.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TiUEvmC84bRsteqsWXHY2p