Fix Scribe mobile inline never showing modal

- The context.mounted check was placed after onTapFallback?.call()
- The onTapFallback function calls controller.saveAndUnfocusForModal() which unfocuses the editor
- This caused the context to become unmounted so the context.mounted check would return early
- As a result the modal would never be show

scribe/lib/scribe/ai/presentation/widgets/button/inline_ai_assist_button.dart

@@ -43,12 +43,10 @@ class InlineAiAssistButton extends StatelessWidget {
       size = renderBox.size;
     }
 
-    await onTapFallback?.call();
-
-    if (!context.mounted) return;
-
     final isScribeMobile = AiScribeMobileUtils.isScribeInMobileMode(context);
 
+    await onTapFallback?.call();
+
     await AiScribeModalManager.showAIScribeModal(
       isScribeMobile: isScribeMobile,
       imagePaths: imagePaths,