[Android/Termux] Fix duplicate UI and repeated auth prompts caused by relauncher loop and resize remounting

This issue report describes two major UX problems on Android/Termux.

1. Relauncher Loop (Duplicate Logos and Auth prompts): When Termux is moved to the background, Android often kills the high-resource child process. The parent monitoring process then restarts a new child, leading to duplicate ASCII logos and repeated OAuth login prompts.

2. UI Remounting on Resize: Virtual keyboard toggles trigger terminal resizes. The current React key mapping forces a full remount, which clutters terminal history with new Headers.

Proposed Fixes (Tested):

• In packages/cli/src/utils/relaunch.ts: Disable relauncher if os.platform() is 'android'.
• In packages/cli/src/gemini.tsx: Use a stable key for AppContainer on 'android' to prevent full remounts.

Full technical details and patch were verified in a local Termux environment. Improving stability for mobile CLI users would be a great addition to Gemini CLI.