Foundation for routing hardcoded UI labels through the catalog (D-21). Two
enablers:
- ExtensionManager now eagerly loads each activated extension's own-id catalog
namespace, not just the namespaces of localized tabs. An extension's id IS
its catalog namespace (ClideExtension.t), so labels resolve through the
catalog even for extensions that contribute no tab; a missing catalog file
loads as an empty map, so it's harmless.
- ClideSettings.i18n gains string()/interpolated() lookups so widget call
sites route through the one D-101 facade (like theme/fonts) instead of each
re-deriving ClideKernel.of(context).i18n.
No user-visible change yet — placeholders equal the en_US catalog values; the
per-extension label migrations follow.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>