fix: Correct i18n workflow git commit logic

The previous workflow was resetting the branch which discarded the
generated locale changes. This fix simplifies the commit logic to
just add and commit the changes directly without branch manipulation.

The issue was:
- git stash + git checkout -B would reset to remote, losing changes
- The detached HEAD in GitHub Actions made stash operations unreliable

The fix:
- Remove unnecessary git stash/checkout operations
- Directly add, commit, and push the locale changes

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

.github/workflows/i18n-update-core.yaml

@@ -48,12 +48,10 @@ jobs:
       run: |
         git config --global user.name 'github-actions'
         git config --global user.email 'github-actions@github.com'
-        git fetch origin ${{ github.head_ref }}
-        # Stash any local changes before checkout
-        git stash -u
-        git checkout -B ${{ github.head_ref }} origin/${{ github.head_ref }}
-        # Apply the stashed changes if any
-        git stash pop || true
         git add src/locales/
-        git diff --staged --quiet || git commit -m "Update locales"
-        git push origin HEAD:${{ github.head_ref }}
+        if ! git diff --staged --quiet; then
+          git commit -m "Update locales"
+          git push origin HEAD:${{ github.head_ref }}
+        else
+          echo "No locale changes to commit"
+        fi