Send event to Sentry and Intercom when "Server Error" page shows up

# Problem


I'm not quite positive how this will work, but when a user hits the "Server Error" page, we do have access to Intercom, and Sentry, for sending events.

We could:

- Send an error to Sentry
- Send an event to Segment (and Intercom)
- Automatically send a message to the user in-app asking them what preceded the error and apologizing for it

先找出「Server Error」頁面，並檢查此應用程式是否已整合 Sentry、Intercom 或 Segment。在實作之前，釐清需要哪些事件和使用者訊息；完成的定義應是已對錯誤頁面的行為達成共識，並驗證事件已送達。

由索引模型根據 Issue 內容生成。