Android support — track

[LeslieOA]

Tracking issue for Android support, the third platform alongside iOS and macOS.

Backing library

Sora-Editor by Rosemoe. The only viable native Android source-editor library — actively maintained (~87 commits / 90 days), TextMate and Tree-sitter highlighting (richer than STTextView), real production use inside AndroidIDE. The Android ecosystem is a near-monoculture here; alternatives are all regex-only, stale, or hobby-grade.

Known risks (proceeding eyes-open)

• License: LGPL-2.1. Consumed dynamically as a Gradle implementation AAR (no source modification, no static linking) it's compatible with permissive downstream apps. README must document the inheritance.
• Bus factor ≈ 1. Single maintainer (1,954 commits vs feat(macos): add macOS platform target to Expo Module #2 at 240).
• Perpetual 0.x. Every release marked prerelease; expect ~yearly breaking changes (e.g. 0.23→0.24 made Span an interface).
• NDK/JNI via oniguruma for TextMate regex → multi-ABI APK size impact.

Sub-tasks

Each becomes a separate PR. The tracking issue stays open until the last one lands.

• Fabric skeleton + MVP — wipe the legacy Expo-module stub in android/. Bare-RN Fabric component setup (Gradle, manifest, codegen wiring, ReactPackage). MVP props: `text`, `editable`, `onChangeText`, `onSelectionChange`, focus/blur ref. Sora-Editor embedded but no highlighting / theming yet. Goal: render an editable Sora editor in an example app and round-trip text changes.
• Android example app — `example/android-app/` (bare RN, mirrors `example/macos-app/` shape). Workflow scripts: `android:install`, `android:start`, `android:run`, `android:dev`.
• `font` + `contentInsets` + `lineNumbers` — wire to Sora's typeface, padding, line-number gutter APIs.
• `theme` (light/dark/auto) — map to Sora's color schemes.
• `language` (highlighting) — wire to Sora's TextMate language registry. Match the existing iOS/macOS language set: plaintext, markdown, json, javascript, typescript, html.
• CI — extend `.github/workflows/ci.yml` to build Android.
• Docs — README platform table, `docs/installation.md` Android section, `docs/examples.md` Android row, CHANGELOG entry. Document LGPL-2.1 inheritance from Sora-Editor.

Out of scope here

Code folding, autocomplete, find/replace — these are post-parity work, separate issues if filed.