T3 Code Nightly 0.0.39-nightly.20260905.1290 (f8b4c464b476)

What's Changed

• fix(web): align tool disclosure chevrons with expanded state by @maria-rcks in #9935
• fix(antigravity): distinguish session initialization auth failures by @maria-rcks in #9919
• fix(cursor): cache successful model discovery between refreshes by @maria-rcks in #9918
• fix(opencode): revert from the first removed assistant message by @maria-rcks in #9924
• fix(web): resume imported custom-provider threads by @juliusmarminge in #10184
• test(web): cancel pending highlight fixture frames during cleanup by @juliusmarminge in #10188

Full Changelog: v0.0.39-nightly.20260905.1289...v0.0.39-nightly.20260905.1290