Replace tab-based show/hide with always-visible sections and anchor
link navigation, matching the primary school detail page behaviour.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
The overview tab was sparse for schools without parent view data, showing
only 2 cards. Now shows:
- Individual Ofsted grades when no overall effectiveness (post-Sept 2024)
- Admissions summary card (PAN, applications, 1st choice rate)
- School context card (pupils, capacity, SEN support, EHCP)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>