* optimize recordings/summary endpoint db query
replace strftime with integer arithmetic. increases speed by about 6x, especially noticeable for installs with long retention days
* optimize calendar rendering with Set lookups and remove unnecessary remount key
The old code built Date[] arrays with a TZDate object for every day in recording history (365+ timezone-aware date constructions). react-day-picker then did O(visible × history) date comparisons to match each of the displayed days against these arrays. Now we build Set<string> from the raw keys (zero date construction), and pass matcher functions that do O(1) Set.has() lookups. react-day-picker only calls these for visible days
* clean up
e8b9225175