Add five native-platform features to the winit desktop host
(op-host-desktop), closing the gap with the Electron app:
- Native menu bar (muda) — File / Edit / View / Help plus the macOS
app menu; selections route to the same host actions the keyboard
shortcuts use. Gated to macOS / Windows — muda needs GTK, which
this winit build does not link, so Linux keeps the in-canvas File
menu.
- Auto-update — a background probe of the GitHub releases API
reports status into the settings System tab; a found update
offers to open the download page, and a "Check for Updates" menu
item re-runs the probe.
- File association — argv parsing opens a .op / .pen document on
launch; [package.metadata.bundle] declares the OS-level handler.
- Window-state persistence — position / size / maximized restore
across restarts, with an off-screen guard for monitor changes.
- Drag-and-drop — dropping a .op / .pen file opens it.
Codex review round 1 findings (1 MAJOR + 3 MINOR) all addressed:
monitor-aware restore, failed-startup geometry guard, single-flight
update probe, case-insensitive extension match.
Also sink the agent-settings modal's hand-maintained EN/ZH string
table into the canonical 15-locale op-i18n tables, so the settings
chrome (including the new auto-update strings) is fully translated;
agent_settings_i18n.rs is now a thin op-i18n adapter.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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