Improve hardware keyboard and editor focus handling
- Map physical Tab, arrow, and Enter keys to the terminal actions used by the on-screen controls.
- Keep focus in the terminal input after command submission.
- Focus editor content fields when editor dialogs open.
- Remove the app fallback path when native Git is unavailable and show a startup blocker instead
- Fix native level setup for staged file counting and cherry-pick parity
- Improve manpage loading/search and bundle full Git documentation assets
- Integrate Git cross-compilation into AndroidProjectTooling.sh and remove debug AAB support
- Rename CrossCompileGitForAndroid.sh to CompileGitForAllTargetPlatforms.sh and support host, Android-only, and all-target modes.
- Compile a development-host Git binary at build/host-git/libgit.so for JVM tests.
- Route level and sandbox tests through GITHUG_TEST_GIT_BINARY so they exercise the compiled host Git rather than the system Git fallback.
- Cross-compile packaged Git binaries for arm64-v8a, armeabi-v7a, x86, and x86_64 Android targets.
- Remove the temporary device-bound Pull rebase instrumentation path from the previous debugging attempt.
