refactor(auth): support async deferred actions for login gating

Allow deferred login actions to return promises and execute them safely without violating lint rules. Also initialize order detail timer state without impure render-time Date.now calls so React hook purity checks pass.

store/login-dialog.ts

@@ -2,8 +2,8 @@ import { create } from "zustand"
 
 interface LoginDialogState {
   open: boolean
-  pendingActions: Array<() => void>
-  openLoginDialog: (action?: () => void) => void
+  pendingActions: Array<() => void | Promise<void>>
+  openLoginDialog: (action?: () => void | Promise<void>) => void
   closeLoginDialog: () => void
   consumePendingAction: () => void
 }
@@ -21,7 +21,7 @@ export const useLoginDialogStore = create<LoginDialogState>((set, get) => ({
     const actions = get().pendingActions
     set({ pendingActions: [] })
     actions.forEach((action) => {
-      action()
+      void action()
     })
   },
 }))