fix(terminal): commit native IME composition safely

[ZacharyZcR]

Summary

• replace heuristic hidden TextInput handling with a local Expo native input view
• send only committed iOS and Android IME text, excluding marked/composing text
• keep special-key translation and cross-source deduplication in one TypeScript mapping
• preserve the current remote-desktop protocol session behavior
• include only the native IME module and required autolinking configuration

This extracts the terminal input work from #38 onto dev-1.5.0. The original implementation commits remain authored by Tink (goxofy). Auth/session persistence, settings, and CI workflow changes were intentionally excluded because they are unrelated or already superseded.

Verification

• npx tsc --noEmit
• npm run lint (0 errors; existing warnings only)
• npm run format:check
• npx expo-modules-autolinking verify --platform ios
• npx expo-modules-autolinking verify --platform android
• resolved module discovery for both iOS and Android
• git diff --check

Supersedes #38.