feat: enhance UI consistency and improve spacing across components

- Added styles for player-side toast notifications to improve user feedback.
- Adjusted padding and spacing in various components for a more cohesive layout.
- Updated card and dialog components to streamline visual hierarchy and enhance readability.
- Refactored player panel and navigation elements for better alignment and user experience.

src/lib/utils.ts

@@ -4,3 +4,15 @@ import { twMerge } from "tailwind-merge"
 export function cn(...inputs: ClassValue[]) {
   return twMerge(clsx(inputs))
 }
+
+/** 幂等键：优先 Web Crypto，HTTP/旧环境回退为类 UUID 字符串 */
+export function randomIdempotentKey(): string {
+  if (typeof crypto !== "undefined" && typeof crypto.randomUUID === "function") {
+    return crypto.randomUUID()
+  }
+  return "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx".replace(/[xy]/g, (c) => {
+    const r = (Math.random() * 16) | 0
+    const v = c === "x" ? r : (r & 0x3) | 0x8
+    return v.toString(16)
+  })
+}