On iOS `UIScreen.main.brightness` is a global device setting, not a
per-window one like Android. Once Readest overrode it (brightness slider
or left-edge swipe gesture) the override survived backgrounding, so
swiping to the home screen left the system stuck at an extreme level and
ambient auto-brightness appeared locked. The only cleanup lived in the
reader's unmount effect, which never runs when the app is merely sent to
the background, and the native `brightness < 0` "release" branch was a
no-op stub.
Native (NativeBridgePlugin.swift): capture the system brightness before
the first override, restore it on `appDidEnterBackground` so iOS resumes
auto-brightness, and re-apply the app's value on `appWillEnterForeground`.
Implement the negative-value release path (restore + forget state),
mirroring Android's BRIGHTNESS_OVERRIDE_NONE.
JS (useScreenBrightness hook, replacing the racy inline Reader effect):
apply the manual brightness while reading, release via
setScreenBrightness(-1) on unmount and when "System Screen Brightness" is
toggled back on. Excludes screenBrightness from deps so live slider/gesture
drags don't flash release-then-reapply.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Huang Xin
849f151166