fix(notification): ignore stale refreshes

[HandSonic]

Related issue

N/A - no matching issue was found.

Summary

Notification list and unread-count requests only checked whether the component was mounted. A slower mount or mark-read refresh could therefore overwrite a newer manual refresh. This change gives list and unread requests independent generations and invalidates both channels on unmount.

Affected surfaces

• Frontend / Web
• Backend / API / Storage
• Database plugin / Driver
• JCEF / Desktop packaging
• CI / Build / Release
• Documentation only

Verification

• Commands and results:
  • Red tests committed refresh data and then regressed to mount data for both channels.
  • Notification coordinator and main-navigation contracts: passed.
  • Targeted ESLint: passed.
  • Full Community build and production bundle verifier: passed.
  • Fork code and CodeQL checks: passed.
• Manual verification: N/A - independent deferred list/unread promises reproduce reverse completion without a browser.
• UI evidence: N/A

Risk and compatibility

• Public API or stored data: No API or persisted-state changes.
• Database or driver compatibility: N/A.
• Network, privacy, or security: N/A.
• Community / Local / Pro boundary: Shared Community notification UI.
• Backward compatibility: Latest list/unread responses retain existing rendering and mark-read behavior.

Reviewer map

• Start here: NotificationRefreshCoordinator and guarded query functions in NotificationNav.
• Failure condition: an older response commits or an unread-only refresh invalidates the list channel.
• Rollback or disable path: Revert commit 20e91222a810dee8af7be623fab707c2262acc09; no migration is required.

Contributor declaration

• I linked the Issue that defines this change.
• I tested the affected behavior and reported the actual results above.
• I did not include credentials, private data, or generated build output.
• I disclosed substantial AI assistance below, or this PR contains no substantial AI-generated code.

AI assistance: OpenAI Codex assisted with diagnosis, implementation, deterministic tests, verification, and adversarial review.

[HandSonic]

重新核对 Community 当前入口后确认，NotificationNav 已在 Community 边界重构中移除，当前没有生产引用；这项修复没有可达的 Community 用户路径。为避免维护不可达组件，主动关闭。若通知入口重新启用，可基于现有测试和实现重新提交。