Fix screenshot permission gating by model support

Author: Android-PowerUser

app/src/main/kotlin/com/google/ai/sample/GenerativeAiViewModelFactory.kt

@@ -56,6 +56,7 @@ enum class ModelOption(
         ApiProvider.GOOGLE,
         "https://huggingface.co/na5h13/gemma-3n-E4B-it-litert-lm/resolve/main/gemma-3n-E4B-it-int4.litertlm?download=true",
         "4.92 GB",
+        supportsScreenshot = true,
         isOfflineModel = true,
         offlineModelFilename = "gemma-3n-e4b-it-int4.litertlm",
         offlineRequiredFilenames = listOf("gemma-3n-e4b-it-int4.litertlm")

app/src/main/kotlin/com/google/ai/sample/feature/multimodal/PhotoReasoningScreen.kt

@@ -406,9 +406,10 @@ fun PhotoReasoningScreen(
                                     return@IconButton
                                 }
 
-                                // Check MediaProjection for all models except offline and human-expert
-                                // Human Expert uses its own MediaProjection for WebRTC, not ScreenCaptureService
-                                if (!isMediaProjectionPermissionGranted && !com.google.ai.sample.GenerativeAiViewModelFactory.getCurrentModel().isOfflineModel && modelName != "human-expert") {
+                                // Check MediaProjection only for models that support screenshots and are not human-expert.
+                                // Human Expert uses its own MediaProjection for WebRTC, not ScreenCaptureService.
+                                val currentModel = com.google.ai.sample.GenerativeAiViewModelFactory.getCurrentModel()
+                                if (!isMediaProjectionPermissionGranted && currentModel.supportsScreenshot && modelName != "human-expert") {
                                     mainActivity?.requestMediaProjectionPermission {
                                         // This block will be executed after permission is granted
                                         if (userQuestion.isNotBlank()) {