release: cut 0.3.0

Ships the M5 reminders onboarding + Settings screen alongside the reworked
overview (Today progress ring, live Upcoming preview, unfurling search) and
the real launcher mark.

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

app/build.gradle.kts

@@ -29,8 +29,8 @@ android {
         // release itself (versionCode is pinned to MAJOR*10000 + MINOR*100 +
         // PATCH from versionName, e.g. 0.2.0 -> 200). The Gitea release is marked
         // as a pre-release while MAJOR is 0. See docs/RELEASING.md.
-        versionCode = 202
-        versionName = "0.2.2"
+        versionCode = 300
+        versionName = "0.3.0"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
     }