An update can clear the WebView's localStorage; the theme is then restored from
the portable DB pref, but GetUIPref returned ("", nil) while the settings store
was still starting (indistinguishable from a genuinely-unset pref), so the
self-heal gave up after ~2.4s and fell back to the light default.
GetUIPref now returns an error when the settings store isn't wired yet, and the
theme self-heal treats that as "not ready → keep retrying" (up to ~36s) vs a
real empty answer ("unset → keep default"). A dark theme survives the relaunch.
rouggy
ede9461010