Fix document crop auto-detection and touchscreen editing

.github/workflows/crop-test.yml

@@ -0,0 +1,40 @@
+name: Crop Fix Test Build
+
+on:
+  push:
+    branches:
+      - fix/document-crop-interaction
+  pull_request:
+    branches:
+      - main
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  build-debug:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: "17"
+
+      - name: Set up Gradle
+        uses: gradle/actions/setup-gradle@v4
+
+      - name: Build debug APK
+        run: ./gradlew :app:assembleDebug --stacktrace --console=plain
+
+      - name: Upload test APK
+        uses: actions/upload-artifact@v4
+        with:
+          name: docuscan-crop-fix-debug
+          path: app/build/outputs/apk/debug/*.apk
+          if-no-files-found: error
+          retention-days: 14

app/src/main/java/com/docuscan/app/DocViewModel.kt

@@ -67,6 +67,14 @@ class DocViewModel(app: Application) : AndroidViewModel(app) {
     var returnToEditor by mutableStateOf(false)
         private set
 
+    /** Camera preference that lasts only while this app process is alive. */
+    var cameraPreferredForSession by mutableStateOf(false)
+        private set
+
+    /** The next captured camera page should open directly in the crop editor. */
+    var autoCropNextPage by mutableStateOf(false)
+        private set
+
     /** Update-check state, driven by the UI (which owns the coroutine scope). */
     var latestUpdate by mutableStateOf<UpdateInfo?>(null)
         private set
@@ -90,11 +98,20 @@ class DocViewModel(app: Application) : AndroidViewModel(app) {
         screen = Screen.Tabs
     }
 
-    fun openCamera(fromEditor: Boolean) {
+    fun openCamera(fromEditor: Boolean, autoCrop: Boolean = false) {
         returnToEditor = fromEditor
+        autoCropNextPage = autoCrop
         screen = Screen.Camera
     }
 
+    fun updateCameraPreferredForSession(enabled: Boolean) {
+        cameraPreferredForSession = enabled
+    }
+
+    fun consumeAutoCropNextPage() {
+        autoCropNextPage = false
+    }
+
     fun closeCamera() {
         screen = if (returnToEditor) Screen.Editor else Screen.Tabs
     }