Fix image sizing to properly fill containers

- Set max-width: 100% and max-height: 100% for images
- Images now expand to fill available space while preserving aspect ratio
- Added width: 100% to container for proper sizing
- object-fit: contain ensures images stay within bounds

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

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

app.py

@@ -739,7 +739,16 @@ css = """
     justify-content: center !important;
     align-items: center !important;
     min-height: 400px !important;
-    max-height: !important;
+    max-height: 500px !important;
+    width: 100% !important;
+}
+.image-container img {
+    max-width: 100% !important;
+    max-height: 100% !important;
+    width: auto !important;
+    height: auto !important;
+    object-fit: contain !important;
+    object-position: center !important;
 }
 """