Add unified single-row status bar

[astroboii47]

Summary

• Add Unified as a third status bar presentation alongside Extended and Pastierina.
• Render text suggestions in the existing variation row while keeping the configured status buttons.
• Preserve suggestion tap, long-press hide, add-word, auto-capitalization, and expansion behavior.
• Add settings persistence regression coverage.

Testing

• ./gradlew testNightlyDebugUnitTest assembleNightlyDebug