fix: remove pre-compressed CSS files to serve updated custom theme

Updated entrypoint-wrapper.sh to delete .css.gz files after injecting
custom CSS. The web server was serving old pre-compressed files instead
of our updated CSS with the Pivoine theme.

Changes:
- Remove app.css.gz and app-*.css.gz after CSS injection
- Forces web server to serve uncompressed updated CSS files
- Ensures custom Pivoine theme is visible on production

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

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

asciinema/entrypoint-wrapper.sh

@@ -10,6 +10,11 @@ if [ -f /opt/app/lib/asciinema-1.0.0/priv/static/assets/custom.css ]; then
   if [ -n "$CSS_FILE" ]; then
     cat /opt/app/lib/asciinema-1.0.0/priv/static/assets/custom.css >> "$CSS_FILE"
     echo "Custom CSS injected successfully"
+
+    # Remove pre-compressed .gz files so updated CSS is served
+    rm -f /opt/app/lib/asciinema-1.0.0/priv/static/assets/app.css.gz
+    rm -f /opt/app/lib/asciinema-1.0.0/priv/static/assets/app-*.css.gz
+    echo "Removed pre-compressed CSS files to force serving updated version"
   fi
 fi