refactor(main): adopt @gitify/menubar v10 for window/tray/system handling

[afonsojramos]

Summary

• Swap the upstream menubar dependency for @gitify/menubar (v10) and lean on its built-in features.
• Delegate window lifecycle (hideOnClose, escapeToHide, recenterOnTray), tray context-menu wiring/SNI refresh, and the global keyboard shortcut to the menubar instance.
• Drop the now-redundant local glue in lifecycle/window.ts, handlers/tray.ts, and handlers/system.ts, simplifying tests accordingly.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[setchy]

These comments are more for @gitify/menubar

• should we add .github/release.yml to https://github.com/gitify-app/menubar and generate corresponding v10.0.0 Release Notes?
• should we refresh/update https://github.com/gitify-app/menubar/blob/main/PLATFORMS.md?
• could the three screenshot examples in README be generalized to Linux, Windows and macOS without the old version numbers?
• update the Electron compatibility table - https://github.com/gitify-app/menubar/blob/main/PLATFORMS.md

[setchy]

What do you think about a more universal package name such as electron-menubar vs @gitify/menubar.

We could also contribute a Renovate replacement rule which would help all the other consumers of max-mapper/menubar migration from the unmaintained v9 to v10