fix(i18n): localize remaining Claude-pane strings (T-462)

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>

CHANGELOG.md

@@ -38,6 +38,13 @@ heading, and (b) bumping `pubspec.yaml` `version:` in the same commit.
   locale under `assets/i18n/<locale>/`. A new language is a drop-in folder;
   en_US behaviour is unchanged. (T-462)
 
+### Fixed
+
+- **Localized the remaining Claude-pane strings.** Running-indicator verbs, the
+  primary/secondary session titles and banner role, tool-card titles, the
+  step/edit/agent counters, and the folded-activity ticker now resolve through
+  the catalog — completing i18n coverage of the conversation surface. (T-462)
+
 ## [2.7.1] — 2026-06-18
 
 ### Changed