release v2.8.0

The i18n epic (T-462): every user-facing label — panels, dialogs, command
palette, menus, settings, framework chrome — now resolves through the i18n
catalog instead of a hardcoded string. Catalogs are bundled per locale under
assets/i18n/<locale>/<namespace>.json. Adds a live UI-language selector
(Settings → Appearance → Language) and a full Dutch (nl-NL) pack; English
stays the default. Architecture in D-102.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

pubspec.yaml

@@ -13,7 +13,7 @@ description: >-
   subsystem handlers (pane, files, editor, git, pql), and the
   extension framework.
 publish_to: none
-version: 2.7.1
+version: 2.8.0
 repository: https://github.com/postmeridiem/clide
 # Short user-facing tagline (the welcome subtitle, web meta
 # description, etc.). Baked into lib/src/build_info.g.dart by
@@ -82,6 +82,7 @@ flutter:
     # i18n catalogs, one folder per locale (en_us, future nl_nl, …); each holds
     # <namespace>.json. Add a line per new locale folder.
     - assets/i18n/en_us/
+    - assets/i18n/nl_nl/
     - assets/keymaps/
     - assets/licenses.yaml
     - assets/LICENSE