Add MVP features: edit mode, voice input, Gitea push, service autocomplete

- new.tsx: edit mode via editId param, per-field voice dictation (MIC/STOP),
  service autocomplete dropdown from DB history
- incident/[id].tsx: Push to Gitea action reads SecureStore config + md template
- index.tsx: homeView=capture redirects to /new on first mount
- _layout.tsx: onboarding gate wired (useSettings + router.replace)
- ci: GitHub Actions workflow builds debug APK via expo prebuild + Gradle

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.github/workflows/build-android.yml

@@ -0,0 +1,51 @@
+name: Build Android APK
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - uses: actions/setup-java@v4
+        with:
+          java-version: '17'
+          distribution: 'temurin'
+
+      - name: Cache Gradle
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.gradle/caches
+            ~/.gradle/wrapper
+          key: gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
+          restore-keys: gradle-
+
+      - name: Generate Android native project
+        run: npx expo prebuild --platform android --clean
+
+      - name: Build debug APK
+        working-directory: android
+        run: |
+          chmod +x gradlew
+          ./gradlew assembleDebug --no-daemon
+
+      - name: Upload APK
+        uses: actions/upload-artifact@v4
+        with:
+          name: SheetHappens-debug-${{ github.sha }}
+          path: android/app/build/outputs/apk/debug/app-debug.apk
+          retention-days: 30