feat: add trigger option for tray event binding

[afonsojramos]

Summary

Introduces Options.trigger — a 'click' | 'right-click' | 'none' enum that controls which tray event toggles the menubar window. Deprecates the showOnRightClick boolean, which is kept as a fallback for one minor.

trigger: 'none' skips all tray click bindings, enabling the one tray icon, multiple anchored windows pattern: a secondary Menubar instance reuses tray-anchored positioning while the caller drives visibility via showWindow() (typically from a context-menu entry).

Why an enum, not a disableClick boolean

The motivating use case was raised upstream as max-mapper/menubar#485 by @haydendonald, who proposed a disableClick: boolean flag. We're going further:

• disableClick is a negative-named boolean, and disableClick: false reads as a double-negative.
• It silently overlaps with the existing showOnRightClick — { showOnRightClick: true, disableClick: true } quietly disables right-click too, since the wrapping if covers both registration paths. The name lies.
• It's asymmetric: there's no disableDoubleClick or disableRightClick, so the API can't grow cleanly.

A single trigger enum subsumes both flags, is self-documenting, leaves room for future values (e.g. 'double-click'), and gives a clean migration path off showOnRightClick.

Migration

Before	After
(default)	(default — trigger: 'click')
showOnRightClick: true	trigger: 'right-click'
(no equivalent — was upstream PR max-mapper#485)	trigger: 'none'

showOnRightClick still works and is honored when trigger is unset; it's marked @deprecated and slated for removal in the next major.

Test plan

• bun run test — 18 tests pass, including 5 new cases for trigger:
  • default binds click + double-click
  • trigger: 'right-click' binds right-click + double-click, not click
  • trigger: 'none' binds nothing
  • unset trigger falls back to showOnRightClick
  • trigger wins over showOnRightClick when both are set
• bun run typecheck — clean
• bun run lint:check — clean (one pre-existing warning, unrelated)
• bun run build — ESM/CJS bundles produced