v1.15.4

Highlights

• Polished Template Gallery release readiness and audit compliance.
• Kept reusable template slide thumbnails aligned with inline-style audit constraints.
• Bumped workspace package versions and release-facing docs to v1.15.4.

Validation

• npm run test
• npm run lint -- --quiet
• npx playwright test tests/e2e/templates.spec.js

Full Changelog: v1.15.3...v1.15.4