macOS: menu bar control to stop recording + consistent dock icon during recording

[meiiie]

Summary

Track two related macOS behaviors around menu-bar and dock presence during recording that make it harder to stop a recording cleanly.

Motivation

Issue #205 combines this with GIF export size / compression. These are different tracks — menu-bar/dock behavior is a macOS platform-integration question while GIF size is an export-pipeline question — and will move faster as two focused issues.

Requested behavior

1. Menu-bar control to stop the active recording without raising the main app window. Reported on macOS Sonoma 14.2 by @santynaren: clicking the menu-bar icon currently brings the app window forward, which gets captured into the recording itself.
2. Stable dock-icon behavior during recording. Reported on macOS Tahoe 26.2, v1.1.21 by @ianjmacintosh: after starting a recording, the Recordly dock icon disappears, making it harder to return focus to the app. Either keep the dock icon visible throughout recording, or, if hiding it is intentional, let the menu-bar control above be the primary stop path.

Related

• Split out from Menu bar Icon and GIF size #205