TYPO3 Sitepackage Prompt Template

Guardrails gathered from previous runs:

Use normal double quotes in PHP overrides.
Add custom frame_class items through page.tsconfig, not via PHP overrides.
Keep session notes (Promts, summaries) outside the extension folder.
Navbar relies on Bootstrap classes only (e.g. navbar-light, navbar-expand-xxl).
Maintain the SCSS hierarchy: Theme variables, Page partials (base/header/footer) and Module partials.