Completes i18n coverage of the conversation surface — the strings the
T-464 migration left as "decorative" English:
- running-indicator verbs (Pondering/Conjuring/… → catalog, Dutch added)
- pane chrome title (primary / secondary N) and banner role
- tool-card titles (Edit → Bewerken) via a tool.name.* key set, with
command/proper-name tools (Bash, Grep, Glob, LS) falling back to the
raw name
- collapser step/edit/agent counters
- the folded-activity ticker (result/error/thinking/image + tool name)
English degrades to the placeholder where a key is absent, so untranslated
or MCP tool names render unchanged. en_us and nl_nl stay at key parity.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Move the catalogs out of lib/kernel/src/i18n/catalog/ into assets/i18n/, and
switch the layout from a `{namespace}_{locale}.json` filename to a per-locale
DIRECTORY: assets/i18n/en_us/{namespace}.json. Adding a language is now just a
new folder (assets/i18n/nl_nl/, nl_be, en_eu, …) of the same namespace files —
no renames — which is cleaner to maintain and mirrors how an external
extension ships its own catalog. AssetCatalogLoader/FileCatalogLoader resolve
`<root>/<locale>/<namespace>.json`; pubspec bundles the locale folder.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>