fix: move theme back to gr.Blocks() for Gradio 5.x compatibility

Gradio 5.x has theme in Blocks(), Gradio 6.x moved it to launch().
Using theme="soft" string works in both versions.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

app.py

@@ -199,7 +199,8 @@ def create_app():
     """Create and configure the Gradio application"""
 
     with gr.Blocks(
-        title="NewPress AI - Johnny Harris Script Assistant"
+        title="NewPress AI - Johnny Harris Script Assistant",
+        theme="soft"
     ) as app:
         app.queue()  # Enable queue before defining event handlers for progress to work
 
@@ -313,6 +314,5 @@ if __name__ == "__main__":
     app.launch(
         server_name="0.0.0.0",
         server_port=7860,
-        share=False,
-        theme="soft"
+        share=False
     )