HUD panel positions and brush values were written only from
OnApplicationQuit/OnDestroy, which is not guaranteed in a build (Alt-F4,
process kill, crash), so layout work was lost. DraggablePanel now exposes
an IEndDragHandler callback that saves the layout the moment a panel is
dropped. Brush-value changes are detected against a disk baseline in
LateUpdate and flushed after a 0.5s debounce so per-frame slider drags
do not write every frame. The teardown save path is removed.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
adminandClaude Opus 4.8
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