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feat: add GitHub OAuth with PKCE and improve login UX

- Add GitHub OAuth login with PKCE (client_id + client_secret)
- Add loading dialog during OAuth token exchange
- Hide logout button when not logged in
- Swap button order: GitHub OAuth first (highlighted), Device Flow second
- Add clear code_verifier after use to prevent duplicate requests
- Fix handleOAuthCallback to skip if already logged in
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feat: add logout button and GitHub App deep link for login

fix: handle missing artifacts in pre-release step

fix: add Safety docs to unsafe FFI functions for clippy

fix: add JNI bridge for Android and update gradle wrapper

- Add JNI wrapper functions in ffi.rs to bridge Kotlin external fun
  to Rust C-style FFI exports
- Add jni crate as Android-only dependency
- Upgrade Gradle to 9.3.1 for AGP 9.1.0 compatibility
- Add gradlew wrapper scripts and jar
- Add android.overridePathCheck for non-ASCII project paths

feat: set window icon from altstore/icon.png

feat: set window icon from altstore/icon.png

HostSync v1.0.1

HostSync v1.0.0

Package Windows installers for releases