Enhance ConnectionPlaceholder component to handle missing device IP with localized messages; update DeviceContext to manage IP state; improve CSS for touch actions in various components; update locale files for English and Chinese with new connection prompts.

client/src/lib/deviceIp.ts

@@ -7,5 +7,5 @@ export function getDeviceIpFromUrl(): string | null {
 }
 
 export function resolveInitialDeviceIp(): string {
-  return getDeviceIpFromUrl() ?? localStorage.getItem("luxsin_ip") ?? "192.168.2.30";
+  return getDeviceIpFromUrl() ?? "";
 }