feat: update banner to mainnet

[dewabisma]

Just changing planck to mainnet and make uptime live data

[n13]

Reviewer model: GPT 5.6 Sol

APPROVE — no blocking findings at 53bb22f3da81f53027c1cbb4e677ade51c517a94.

The mainnet telemetry switch matches the live feed: Quantus is advertised under the new genesis hash, and the uptime path targets Grafana panel 82 (Mainnet Bootnodes - Uptime) using its configured lastNotNull reduction. The parser, same-origin client path, local Vite adapter, Pages Function, and ticker update are consistent with that contract.

Validation:

• npx --yes bun@latest test — 30 passed, 0 failed.
• Prettier on all eight changed files — passed; the repository-wide check still reports 26 unrelated pre-existing files.
• SITE_BASE_URL=http://localhost:3000 npx --yes bun@latest run build — passed.
• npx --yes wrangler@latest pages functions build ... — passed, and the bundled Pages runtime returned HTTP 200 with a finite live percentage and Cache-Control: public, max-age=60.
• git diff --check — passed.

GitHub reports no CI checks for this branch. Plain repository-wide tsc --noEmit is also not a clean signal because the existing project configuration lacks Bun test and one Astro component declaration; the changed non-test uptime/Pages modules type-checked directly. No blocking findings remain.