Improve Gradio UI layout: make chat window shorter and enable full-screen width

- Reduced chat window height from 500px to 400px for more compact layout
- Removed max-width limitation to enable full-screen usage
- Updated CSS to use 100% width and improved padding
- Enhanced header styling with more compact feature list
- Restored README.md for Hugging Face deployment

src/sales_assistant/ui_dashboard/gradio_app.py

@@ -101,17 +101,25 @@ def create_gradio_interface():
     
     # Create the interface
     with gr.Blocks(
-        title="Sales Assistant with Quote Generation",
+        title="Streamnet Sales Assistant with Quote Generation",
         theme=gr.themes.Soft(),
         css="""
         .gradio-container {
-            max-width: 1200px !important;
+            max-width: 100% !important;
+            width: 100% !important;
+            margin: 0 auto !important;
+            padding: 20px !important;
             font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
         }
         /* ensure main text elements inherit the font */
         .gradio-markdown, .gradio-chatbot, .gradio-textbox, .gradio-button, .gradio-accordion {
             font-family: inherit;
         }
+        /* Make the main content area full width */
+        .main, .container {
+            max-width: none !important;
+            width: 100% !important;
+        }
         """
     ) as interface:
         # load Google Font (Inter)
@@ -119,15 +127,12 @@ def create_gradio_interface():
         
         gr.Markdown(
             """
-            # 🤖 Sales Assistant with Quote Generation
-            
+            # 🤖 Streamnet Sales Assistant with Quote Generation
+
             Welcome to the Sales Assistant! I can help you:
-            - 🔍 Search and explore our product database
-            - 📊 Analyze product data and statistics
-            - 💰 Generate quotes with pricing
-            - 🌍 Provide exchange rate information
-            - ❓ Answer questions about our products and services
-            
+
+            **🔍 Search products**   |   **📊 Analyze data**   |   **💰 Generate quotes**   |   **🌍 Exchange rates**   |   **❓ Answer product questions**
+
             Simply type your question or request below to get started!
             """
         )
@@ -135,7 +140,7 @@ def create_gradio_interface():
         # Chat interface
         chatbot = gr.Chatbot(
             value=[],
-            height=500,
+            height=400,
             label="Sales Assistant Chat",
             show_label=True,
             avatar_images=(