v0.6.8: hide the menu bar icon on macOS (#44)

[karem505]

Summary

• macOS: Show menu bar icon setting (Add setting to disable menu bar icon #44). A switch under Settings → Behavior, shown only on macOS and on by default.
  • When off, the tray icon is hidden with TrayIcon::set_visible(false), and a hidden window comes back from the Dock icon through the existing RunEvent::Reopen handler.
  • Windows and Linux always keep the tray icon, because there it is the only way back to a window closed to the tray.
  • A settings.json without the new field keeps the icon.
  • The row sits last in the Behavior list, because the list's CSS removes the separator after a hidden row.
• Release v0.6.8: version bump in Cargo.toml, tauri.conf.json and Cargo.lock, a metainfo release entry, and docs/release-notes/v0.6.8.md. The notes cover this change and what Linux calling FAQ; Windows Display size list and toast logo (#39, #40) #43 already merged (Your browser doesn' support calling. Please update your browser or try another browser #39, Display size dropdown visual bug + QoL improvements (Zoom shortcuts, notification icon, custom download folder) #40).

PR #42 (macOS native file drops) is not included. It's waiting for its fork CI to be approved. If it merges before the tag, its release-notes line should be added here.

Testing

• cargo test --locked: 106 passed, including new default and old-settings-file assertions.
• cargo clippy --all-targets -- -D warnings: clean on Linux.
• cargo clippy --target aarch64-apple-darwin: builds, with only the 3 warnings that were already there.
• cargo fmt --check and node --check settings-ui/main.js: clean. Bridge tests pass.
• Not tried on a real Mac: hiding and showing the icon, and getting the window back from the Dock.

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https://claude.ai/code/session_01L8dUghRiNrKrHHR5BNMSSD

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