fix: enable code shrinking and add ProGuard rules for ML Kit text recognition

android/app/build.gradle.kts

@@ -35,6 +35,12 @@ android {
             // TODO: Add your own signing config for the release build.
             // Signing with the debug keys for now, so `flutter run --release` works.
             signingConfig = signingConfigs.getByName("debug")
+            isMinifyEnabled = true
+            isShrinkResources = true
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
         }
     }
 }

android/app/proguard-rules.pro

@@ -0,0 +1,7 @@
+# Google ML Kit text recognition — keep all script-specific recognizer classes
+-keep class com.google.mlkit.vision.text.** { *; }
+-keep class com.google.mlkit.vision.text.chinese.** { *; }
+-keep class com.google.mlkit.vision.text.devanagari.** { *; }
+-keep class com.google.mlkit.vision.text.japanese.** { *; }
+-keep class com.google.mlkit.vision.text.korean.** { *; }
+-dontwarn com.google.mlkit.vision.text.**