The shell's base stylesheet makes every direct body child no-drag
(`html[data-platform=darwin] body > :not(#root)`). The viewport-sized
`[data-dsh-panel-host]` layer inherited it, and since app-region ignores
pointer-events it cancelled every window-drag strip beneath it once the
shell recomputed regions.
Take the host and layer out of the app-region computation (`!important`,
the shell selector carries an id's specificity) and keep the panels
themselves no-drag so their controls still receive clicks.
Fixes#772
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
