Pastiera Enhanced feature set

[astroboii47]

Summary

• ports the full Pastiera Enhanced feature set from the fork
• includes GIF/local media picker, typed shortcut expansions, prediction improvements, theme/per-app/frosted glass improvements, custom emoji font support, emoji asset updates, and related UI polish

Notes

• this is the complete snapshot branch for maintainers who prefer one bundled PR
• smaller draft PRs also exist for easier review of specific feature areas
• fork-specific branding/release metadata may need maintainer review before merging

Testing

• Enhanced 4.2 debug APK was built and published from this branch
• smaller extracted PRs have each passed ./gradlew :app:assembleDebug

[astroboii47]

Closing this version in favor of #258, which keeps the same complete feature-set intent but uses a cleaned branch/commit history and leaves fork release metadata out of the upstream diff.