fix(dashboard): fallback for crypto.randomUUID on HTTP (non-secure context)

crypto.randomUUID() is only available over HTTPS. Add a timestamp+random
fallback so the dashboard works on plain HTTP during development/IP access.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/dashboard/src/lib/terminal.ts

@@ -4,7 +4,9 @@ export function getOrCreateTerminalId(): string {
   if (typeof window === "undefined") return "server";
   let id = localStorage.getItem(TERMINAL_KEY);
   if (!id) {
-    id = crypto.randomUUID();
+    id = typeof crypto.randomUUID === "function"
+      ? crypto.randomUUID()
+      : `${Date.now().toString(36)}-${Math.random().toString(36).slice(2)}`;
     localStorage.setItem(TERMINAL_KEY, id);
   }
   return id;