[07-Release] #311 v0.4.1 — ChatScreen LLM warm-up

CHANGELOG 0.4.1 항목 + pubspec 0.4.0+4 → 0.4.1+5.

Release artifact:
- app-release.apk 288MB (301.0MB raw / 288MB on-disk)
- SHA-256: 62b96a876afbda24e1cd3b9bf95db742255db5f40fc46eb08cb5cf824d3ec481
- Build: flutter build apk --release (Gradle assembleRelease 70.2s)

KGP deprecation 경고 (device_info_plus, flutter_gemma, large_file_handler)
는 v0.4.0 release 노트와 동일. 미해결.

Refs #311

app/pubspec.yaml

@@ -1,7 +1,7 @@
 name: life_helper
 description: "Huberman + Atomic Habits + Tiny Habits + If-Then. Local-first habit/checklist/todo."
 publish_to: 'none'
-version: 0.4.0+4
+version: 0.4.1+5
 
 environment:
   sdk: ^3.12.2