v1.5.4 — Restore Antigravity Gemini quota again

What's Changed

• Fixed Antigravity accounts showing "Gemini: no data" again instead of usage bars.
• The quota API now hides the Gemini group from clients older than 2.6.0. KeySwitcher sent a hardcoded antigravity/2.3.1 user agent; it now reports the version of the installed Antigravity app (falling back to 2.28.1).
• Gemini and Claude / GPT 5-hour and weekly bars show real remaining quota again.
• Updated the macOS app to version 1.5.4 (build 15).

Installation

• macOS: download KeySwitcher-1.5.4.zip, or clone the repository and run ./install.sh.
• Windows: clone the repository and run install.ps1.

macOS signing note

The attached macOS app is signed with Apple Development. A Developer ID notarized distribution is not included in this release.