Phase 4+5: iOS + Android keyboard extensions — all platforms complete #3997

Originally written by @ccantynz-alt on GitHub.
Imported from https://github.com/ccantynz-alt/48co.v1/pull/40

Phase 4 + 5: iOS + Android Keyboard Extensions

All 5 build phases complete. 48co now has code for every platform.

iOS Keyboard (Swift)

• Full QWERTY custom keyboard extension
• 27 grammar rules running locally
• Suggestion bar with tap-to-correct
• Voice button for Whisper transcription
• Globe button for keyboard switching

Android Keyboard (Kotlin)

• InputMethodService with QWERTY layout
• Same 27 grammar rules for consistency
• Suggestion bar with tap-to-correct
• Voice button
• EN-US, EN-GB, EN-AU, EN-NZ subtypes

All 5 Phases Complete

1. Desktop app (Tauri 2.0 + Rust)
2. Local Whisper (on-device speech-to-text)
3. Local grammar (60+ rule engine)
4. iOS keyboard (Swift extension)
5. Android keyboard (Kotlin IME)

Built by Claude. Designed for humans.

https://claude.ai/code/session_01PBeNmPHrD2W6A2YKZRC7V3