## Problem
Supabase Select 2026 has finished. The promo banners already hide via
the scheduled expiry from #51006, but the campaign code, assets, and
wiring are still in the tree.
## Solution
Remove the Select 2026 sitewide promotion across www and Studio:
- Delete shared `Select26*` banner code, font, and tests from
`ui-patterns`
- Delete Studio `BannerSelect2026*` and its Banner Stack registration
- Unmount the www announcement banner and revert the State of Startups
spacing that only existed for it
- Drop the Select-only session-replay `data-band` allowlist entry and
lint ratchet baseline
Event go pages, blog posts, and other Select content are left alone. The
`Announcement` shell stays for the next campaign.
## Review instructions
1. Open the www homepage on the deploy preview. Confirm there is no
Select announcement bar above the nav.
2. Open `/state-of-startups` on the deploy preview. Confirm the hero
still looks correct with no extra top gap from the removed banner.
3. Open a hosted Studio dashboard page on the deploy preview. Confirm
the Banner Stack no longer shows a Select card.
## Checklist
- [x] I have read
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
- [ ] If I wrote a new docs topic or edited an existing topic, I used
the `/write-the-docs` or `/edit-the-docs` skill, which applies the docs
[style
guide](https://github.com/supabase/supabase/tree/master/apps/docs/style-guide)
Danny White
ba82106697