The post-task handler only repainted the app detail page when the finished
task's app WAS the app on screen, and only ever re-rendered that same slug.
An instance removal is neither: it is dispatched for the instance, while the
list that changed — the Instances bar — is drawn on the parent and on every
sibling. Removing an instance from a family page left its pill sitting there.
Now the family (INSTANCE_OF) is read before the apps.json reload — a removed
instance is gone from it afterwards — and the page ON SCREEN is repainted
whenever it belongs to the same family as the completed task, so a pill
appears on create and disappears on remove without a manual refresh.
Also handles the page whose app no longer exists: an instance removal deletes
the app outright (a plain uninstall only flips it to not-installed), and the
removal flow parks the user on the instance's own Tasks tab, so re-rendering
printed "App not found". Land on the type it was an instance of instead.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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