It's more common to write functions in camelCase in JS, so some people
started doing it, including me. But the majority of the codebase is
snake_case, so let's enforce that.
- Add POST /api/test-notification endpoint to send test to saved config URL
- Refactor send_notification to return Result instead of bool
- Add NotificationError enum for proper error handling
- Add test notification button in config UI with explanatory text
- Button tests saved configuration URL, not input field value
Add a reanalyze button for individual recordings in the analysis dropdown
As part of this, split out ApiRequestButton so that state transitions
(clickable -> loading/disabled -> done) can be shared across start/stop
recording and this new button. Other buttons might benefit from this as
well.
Also fix a broken checkbox while we're here.
