Fix CI workflow to use renamed i18n package

Updated GitHub Actions workflow to reference packages/i18n instead of
packages/qti2-i18n which was renamed during the QTI version-agnostic
refactoring.

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

Author: chillenious

.github/workflows/ci.yml

@@ -63,7 +63,7 @@ jobs:
 
       - name: Check translation coverage
         run: |
-          cd packages/qti2-i18n
+          cd packages/i18n
           bun run check-translations
 
   hardcoded-strings:
@@ -81,7 +81,7 @@ jobs:
 
       - name: Scan for hardcoded strings
         run: |
-          cd packages/qti2-i18n
+          cd packages/i18n
           bun run scan-hardcoded
 
   test-unit: