fix(mobile): keep collapsed Android composer placeholder on one line

[tntuser77]

Fixes #10860.

What Changed

Collapsed Android composer now forces single line with ellipsis, and uses minHeight 40 instead of fixed height 36. Expanded state restores multiline.

Files: apps/mobile/src/features/threads/ThreadComposer.tsx, apps/mobile/modules/t3-composer-editor/android/src/main/java/expo/modules/t3composereditor/T3ComposerEditorView.kt

Why

The placeholder Ask the repo agent, or run a command wrapped to two lines inside a single line pill, so the second line clipped below the border. Narrow rows with the plus and stop buttons made it worse. Scaled fonts made it worse.

UI Changes

Before shot attached from the Play Store build. After shot to follow from a patched build.

Verification

CI is the gate. No local Android build run here. Needs a native preview binary to confirm on device.

Checklist

• Small and focused
• Explained what changed and why
• Before and after screenshots attached (before done, after pending)
• No animation change, no video needed

[tntuser77]

Could a maintainer please add the Mobile Continuous Deployment label? I need the preview APK to verify the Android composer fix on my Galaxy S22+.