- Template editors (notification & command) now use EntitySelect for
locale switching and default to the configured primary locale
instead of always 'en' when opening, editing, or cloning a config.
- LocaleSelector's add-flow uses EntitySelect for catalog pick;
custom BCP-47 codes (e.g. de-CH) keep a small dedicated input.
- TimezoneSelector dropdown was being clipped by Card's overflow:hidden
and backdrop-filter; portalled to <body> with an overlay backdrop and
styled as a centered modal palette (same pattern as EntitySelect).
- Removed top padding on the timezone scroll list so sticky region
group headers no longer leak rows above them.
- Extracted shared locale catalog to lib/locales.ts.
