fix: resolve QG-001 typography token drift and QG-006 style violations

Replace raw line-height values with --leading-none/--leading-loose
design tokens in 3 CSS files. Fix 7 PHP style issues: import ordering,
unused imports, brace placement, multi-line argument formatting.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

lib/Service/Module/ModuleMigrationService.php

@@ -18,7 +18,8 @@ final class ModuleMigrationService
     public function __construct(
         private readonly ModuleRegistry $registry,
         private readonly ModuleMigrationRepository $repository,
-    ) {}
+    ) {
+    }
 
     /**
      * Apply all pending module migrations.