Added user-defined URL rules that add your own prefix to matching pages, applied after the container prefix.
Added URL rule management in the options page: add, edit, delete, enable and disable, reorder, and pause all rules.
Added a prefix preview and clearer validation messages for URL match patterns.
Added a "use current tab" helper that fills in a rule pattern from the active tab.
URL rules are now re-evaluated when a single-page app changes route.
Renaming a container now updates the prefix in already-open tabs.
Settings were migrated to schema v2 while keeping the v0.1.0 container prefix behavior.