* feat(themes): add follow-system mode to the theme scheduler
The theme scheduler can now switch the day/night theme pair by the OS
light/dark preference instead of a clock schedule. A segmented control
picks the trigger; in system mode the time inputs are hidden and the two
theme pickers read as Light/Dark.
The OS theme is read via the native Tauri window theme API (theme() +
onThemeChanged) rather than the Web prefers-color-scheme media query,
which is unreliable through WebKitGTK on Linux. Live updates land
instantly where the platform forwards them; on Linux setups that don't,
a hint notes the change applies after an app restart.
* docs(changelog): add follow-system theme mode entry (#1163)
CHANGELOG Added entry, contributor credit and What's New highlight for the
theme scheduler's new system-theme mode.
Psychotoxical
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