fix: Defer DashboardProvider translations to avoid early textdomain loading (v0.4.8)

DashboardProvider constructor also had __() calls during plugins_loaded.
Applied same lazy-initialization pattern as Settings tab labels.

Co-Authored-By: Claude <noreply@anthropic.com>

CLAUDE.md

@@ -295,9 +295,10 @@ add_action( 'wp_prometheus_collect_metrics', function( $collector ) {
 - Fixed `_load_textdomain_just_in_time` warning on admin pages (WordPress 6.7+ compatibility)
 - Root cause: `load_plugin_textdomain()` was called during `plugins_loaded` in `Plugin::__construct()`
 - WordPress 6.7+ requires textdomain loading at the `init` action or later
-- Two changes made:
+- Three classes needed fixing:
   - `Plugin.php`: Deferred `load_textdomain()` to `init` action hook, changed method visibility to public
   - `Settings.php`: Deferred tab label initialization (which uses `__()`) to a lazy `get_tabs()` method
+  - `DashboardProvider.php`: Deferred built-in dashboard definitions (with `__()` calls) to a lazy `get_builtin_dashboards()` method
 - Cleared Known Bugs section — no remaining known issues
 - **Key Learning**: WordPress 6.7 textdomain loading requirements
   - `load_plugin_textdomain()` must be called at `init` or later