* use custom swr fetcher to check for audio support
The go2rtc API doesn't always return stream data for anything not being actively consumed, so audio support was not always being correctly deduced. So we can use a custom swr fetcher to call the endpoint that probes the streams, which returns the correct producers data.
* return correct mime type for thumbnail and latest frame endpoints
follow up to https://github.com/blakeblackshear/frigate/pull/19555
* Indicate no recordings on the history timeline with gray hash marks
This commit includes a new backend API endpoint and the frontend changes needed to support this functionality
* don't show slashes for now
* Organize api files
* Add more API definitions for events
* Add export select by ID
* Typing fixes
* Update openapi spec
* Change type
* Fix test
* Fix message
* Fix tests
