🚀 Fix Gradio schema error by downgrading to v4.20.0

- Downgrade Gradio from 4.44.1 to 4.20.0 (stable version)
- Remove theme parameter causing schema validation issues
- Simplify button parameters (remove size, scale)
- Add string validation in analyze_medical_image function
- Set share=True for Hugging Face Spaces compatibility
- App now launches successfully without schema errors

requirements.txt

@@ -1,6 +1,6 @@
 altair
 pandas
-gradio==4.44.1
+gradio==4.20.0
 fastapi==0.104.1
 uvicorn==0.24.0
 python-multipart==0.0.9

src/gradio_app.py

@@ -361,7 +361,7 @@ def check_system_status():
 
 # Create the Gradio interface
 def create_medivision_app():
-    with gr.Blocks(css=medical_css, title="MediVision - Radiology Report System", theme=gr.themes.Soft()) as app:
+    with gr.Blocks(css=medical_css, title="MediVision - Radiology Report System") as app:
         
         # Header
         create_header()
@@ -416,7 +416,7 @@ def create_medivision_app():
                             height=300
                         )
                         
-                        analyze_btn = gr.Button("🔬 Generate Report", variant="primary", size="lg")
+                        analyze_btn = gr.Button("🔬 Generate Report", variant="primary")
                 
                 # Results Section
                 gr.HTML('<div class="medical-card"><h2>📊 Analysis Results</h2></div>')
@@ -444,10 +444,9 @@ def create_medivision_app():
                 with gr.Row():
                     search_mrn = gr.Textbox(
                         label="Medical Record Number",
-                        placeholder="Enter MRN to search",
-                        scale=3
+                        placeholder="Enter MRN to search"
                     )
-                    search_btn = gr.Button("🔍 Search", variant="primary", scale=1)
+                    search_btn = gr.Button("🔍 Search", variant="primary")
                 
                 search_results = gr.HTML()