chore: add app icon, update checklist

- Add app-icon-512.png (green box, white background)
- Update RELEASE_CHECKLIST.md with completed items

RELEASE_CHECKLIST.md

@@ -28,9 +28,9 @@
 ## Play Console Assets
 
 ### Required Assets
-- [ ] **App Icon**: 512x512 PNG → Store in `app-store-assets/icons/`
+- [x] **App Icon**: 512x512 PNG → `app-store-assets/icons/app-icon-512.png`
 - [ ] **Feature Graphic**: 1024x500 JPG/PNG → Store in `app-store-assets/feature-graphic/`
-- [ ] **Phone Screenshots**: 2-8 images (16:9 or 9:16 ratio, 320-3840px) → Store in `app-store-assets/screenshots/`
+- [x] **Phone Screenshots**: 2 images in `app-store-assets/screenshots/` (need 2-8 total)
 - [ ] **7-inch Tablet Screenshots**: 1-8 images (if supporting tablets)
 
 ### Store Listing
@@ -50,7 +50,7 @@
 
 ---
 
-## Build & Test
+## Build & Test ✅
 
 ### Local Build
 - [x] Run tests: `flutter test` (4 passed)
@@ -75,21 +75,22 @@
 
 ---
 
-## Gitea CI Setup ✅
+## Gitea CI Setup
 
-### Workflow
+### Workflow ✅
 - [x] Create `.gitea/workflows/release.yml`
 
-### Secrets Configuration (Self-Hosted Storage)
+### Secrets Configuration (Self-Hosted Storage) ✅
 - [x] Secrets stored in self-hosted storage (not Gitea):
   - `KEYSTORE_BASE64`: Base64-encoded keystore file
   - `KEYSTORE_PASSWORD`: Keystore store password
   - `KEY_PASSWORD`: Keystore key password
 
 ### Test CI Workflow
-- [ ] Push a tag to trigger build:
+- [x] Git tag `v1.0.0` created
+- [ ] Push tag to trigger build:
   ```bash
-  git tag v1.0.0
+  git push origin main
   git push origin v1.0.0
   ```
 - [ ] Verify AAB artifact is uploaded
@@ -104,11 +105,11 @@
 - [ ] Set app name: "SIAB Scale"
 
 ### Store Listing
-- [ ] Upload screenshots
+- [ ] Upload screenshots (2 in `app-store-assets/screenshots/`)
 - [ ] Upload feature graphic
 - [ ] Add short description
 - [ ] Add full description
-- [ ] Upload app icon (512x512)
+- [ ] Upload app icon (`app-store-assets/icons/app-icon-512.png`)
 
 ### Content
 - [ ] Complete Content Rating questionnaire
@@ -126,23 +127,3 @@
 - [ ] Monitor crash reports in Play Console
 - [ ] Respond to user reviews
 - [ ] Plan updates based on feedback
-
----
-
-## Git Commands Reference
-
-```bash
-# Generate keystore
-keytool -genkey -v -keystore siab-release.keystore -alias siab -keyalg RSA -keysize 2048 -validity 10000
-
-# Base64 encode keystore for CI
-base64 -w 0 siab-release.keystore | pbcopy  # macOS
-base64 -w 0 siab-release.keystore | xclip   # Linux
-
-# Tag and push for CI build
-git tag v1.0.0
-git push origin v1.0.0
-
-# Build locally
-flutter build appbundle --release --obfuscate --split-debug-info=build/debug-info --dart-define=SIAB_DEVICE_NAME=SIAB
-```