feat: import menubar patterns from gitify (hideOnClose, contextMenu, globalShortcut, helpers)

[afonsojramos]

Summary

Imports patterns that gitify-app/gitify currently reaches around the library to implement, plus fixes a leaky abstraction that forced gitify to access a private field.

Fixes

• fix(06dd7cf): switch the library's window cleanup listener from 'close' to 'closed'. Consumer 'close' handlers can now read mb.window and event.preventDefault() without racing our cleanup — removing the need for gitify's _browserWindow workaround.
• fix(45aab90): the right-click context-menu popup now reads the current menu lazily, so setContextMenu() swaps and clears take effect without stale closures.

Features

• feat(f5a0d0e): hideOnClose option intercepts close, defers the hide via setImmediate (Wayland half-closed-surface workaround), and passes through during before-quit / destroy(). escapeToHide option hides the window on Escape via before-input-event.
• feat(f4856b7): ignoreDoubleClickEvents (default true on macOS) calls tray.setIgnoreDoubleClickEvents to prevent tray-icon flicker.
• feat(528631d): contextMenu option. On Linux uses setContextMenu and re-publishes on every show/hide to defeat the libappindicator/SNI cache. On macOS/Windows pops up via tray.popUpContextMenu on right-click so left-click stays bound to the window toggle.
• feat(4d08ff7): setGlobalShortcut(accelerator), toggleWindow(), and recenterOnTray() helpers. globalShortcut is unregistered automatically on destroy().
• refactor(66b9e76): align setContextMenu signature with Electron's Tray.setContextMenu(menu: Menu | null).

Docs / chore

• docs(64a10a8): README documents every new option and method.
• style(1949587): formatter pass on the touched files.

Notes

• Zero new runtime dependencies.
• 62 unit tests pass (was 39); typecheck and lint clean.
• The 'close' → 'closed' change is a behavior change for anyone who registered a 'close' listener on mb.window and depended on it firing before our cleanup. None of the prior tests covered that path; gitify's usage benefits from the new ordering.

Test plan

• bun run test (62/62 passing locally)
• bun run typecheck
• bun run lint:check
• bun run test:e2e on macOS
• Smoke-test on a Linux desktop (Ubuntu/GNOME for SNI; KDE if available)
• Smoke-test on Windows
• Drop into gitify via bun link and confirm the _browserWindow workaround in their close handler can be removed