release: 0.2.0

Promote [Unreleased] → [0.2.0] in the changelog (M2 UI + M3/M4 + fixes) and
bump the dev-default version to 0.2.0 / 200. The pushed tag drives the released
version per docs/RELEASING.md.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/build.gradle.kts

@@ -28,8 +28,8 @@ android {
         // the tag, with versionCode = MAJOR*10000 + MINOR*100 + PATCH
         // (e.g. v2.0.0 -> 20000). These committed values are the dev/local
         // default; keep them matching the latest released tag. See docs/RELEASING.md.
-        versionCode = 100
-        versionName = "0.1.0"
+        versionCode = 200
+        versionName = "0.2.0"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
     }