Fixes a real defect and reworks the calibration/settings flow per Jay's
on-device review.
Bug: the second capture hung on 'capturing'. The completion code wrote
capture=null (a LaunchedEffect key) then awaited the suspend
setSurfaceCalibration BEFORE setting phase=COMPLETE; at the suspension
Compose cancelled the effect mid-write, stranding the transition. The
effect body is now fully synchronous and persistence runs on an
independent scope.launch. Verified end-to-end on device.
Settings screen (new): reached from the Level header gear (was: gear
jumped straight into calibration). Calibration is a sleek button in its
own section; Units, Haptics, and Reduce-motion prefs get a home; Done is
pinned to the bottom while the list scrolls independently.
Calibration screen: two stages. OVERVIEW shows the current correction
(Pitch/Roll offsets), the Thoroughness selector, and Calibrate / Reset
to phone defaults / Done. CAPTURING shows ONLY capture + Cancel; Cancel
restores the prior calibration (saved value is never touched mid-flow).
Instructions centered; outlined buttons given visible borders.
Thoroughness: Simple (2-point, 0/180) or Thorough (4-point,
0/90/180/270). Generalized deriveSurfaceFromSamples averages a symmetric
rotation set - the true tilt sums to zero, so the mean is the device
bias; 4-point also cancels each axis twice and averages more noise. Two
new unit tests (2-point equivalence, 4-point bias recovery).
61 tests passing; assembleDebug clean.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
thejayman77
85a8ce1136