feat(launch): optional creator banner, stored and edited like the logo

[Vasanthdev2004]

Part 3 of 9 of the UI overhaul, stacked on #61. Each PR's diff is only its own step; review and merge in order.

Creators can add one optional wide banner beside the logo. This PR is the data path and the edit sheet; the market cards (part 4), the token page (part 7) and the launch form (part 8) show and offer it.

What changes

• Schema: ALTER TABLE bb_launch_meta ADD COLUMN IF NOT EXISTS banner_url text; (nullable, idempotent).
• Upload route: kind=banner picks the banner processor (1500 x 500 WebP) and a 4 MB cap; logos keep their path. A random key in the same store, never a user-chosen name.
• Saved at launch (meta.ts), replaced by signed edits (editServer.ts), and read with the market list (queries.ts, canonicalised like the logo).
• Signing (editAuth.ts): the banner line joins the signed message only when a banner is set, so messages signed before banners existed still verify.
• The edit sheet offers a banner upload; ImageUpload gains kind="banner" and a stacked layout.

Notes

• Schema change: needs Kevin's approval before it ships (one new nullable column on bb_launch_meta).

Checks on this branch: lint, tsc --noEmit, npm test (849 pass, 0 fail, 10 skipped), next build.

Stack (merge top to bottom)

1. UI overhaul, phase 1: search everywhere, row-to-page morph, rolling live numbers #60 phase 1: search, row-to-page morph, live numbers
2. ui: home as a live floor (river, totals sentence, watchlist, just launched) #61 home as a live floor
3. ui: shared foundations for the overhaul (Geist type, chain marks, vendor kit) #64 shared foundations for the overhaul (Geist type, chain marks, vendor kit)
4. ui: rebuild the header nav #65 rebuild the header nav
5. feat(launch): optional creator banner, stored and edited like the logo #66 optional creator banner, stored and edited like the logo (this PR)
6. ui: market board with cards and denser rows #67 market board with cards and denser rows
7. ui: home floor (hero, live river and bubbles, trending) #68 home floor (hero, live river and bubbles, trending)
8. feat(charts): GeckoTerminal chart with the native chart as fallback #69 GeckoTerminal chart with the native chart as fallback
9. ui: token page hero, trade panel and details #70 token page hero, trade panel and details
10. ui: launch flow as a step rail with a live preview #71 launch flow as a step rail with a live preview
11. ui: posts, how it works, agents and dashboard in the new style #72 posts, how it works, agents and dashboard in the new style

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