fix/restore paste on firefox

[stanley2058]

• restore paste in context menu on firefox

before:

after:

[Copilot]

Pull request overview

This PR restores reliable access to the native “Paste” item in Firefox’s context menu by switching Firefox to the same “capture right-click early” path used for other affected browsers, and by ensuring the right-click cleanup runs even when Firefox doesn’t deliver the expected mouseup event on window.

Changes:

• Treat Gecko (Firefox) as a browser that needs captureRightClick handling.
• In the right-click context menu hack, also listen for contextmenu to trigger the cleanup path when mouseup isn’t fired on window (modern Firefox behavior).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/util/browser.js	Expands captureRightClick to include Gecko so Firefox uses the early right-click handling path.
src/input/TextareaInput.js	Adds a contextmenu fallback listener to reliably run the re-hide cleanup after the native menu opens in Firefox.

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