Improve kiosk mode startup experience

- Pass query parameters to EJS template for kiosk mode detection
- Add kiosk class to body when enabled via query parameter
- Simplify kiosk mode CSS to hide all elements except main weather display
- Add null checks for progress object to prevent errors in kiosk mode
- Prevent navigation errors when no suitable displays are available

index.mjs

@@ -54,6 +54,7 @@ const index = (req, res) => {
 		production: false,
 		version,
 		OVERRIDES,
+		query: req.query,
 	});
 };