feat(website): adopt the shared The Solid Chain sticky header

[robercano-ghbot]

Summary

Normalizes the non-scrolling top chrome across The Solid Chain's family of sites —
thesolidchain.com, reCode, reDeFi, and reDeploy all share the same sticky header pattern
now: a corporate statusbar (row 1, verbatim across every site) and a product-specific
strip (row 2, per-product but same shape).

Row 1 was already added to this site in #166 (the shared statusbar: cream TSC mark linking
to thesolidchain.com, traffic dots, roberto@thesolidchain: ~, the online LED, uptime/region,
amber cursor) — reproduced verbatim from the reference implementation at
recode.thesolidchain.com (source: site/index.html in
robercano/reCode). That part needed no further changes here.

This PR finishes the job on row 2 (the product strip), bringing it in line with brand
book §08: glyph, bold product name, short context — the same shape as reCode's own subbar
(</> reCode — session replay …).

What changed (apps/website)

• Topbar.tsx: reordered to glyph-first (^^ in lime #D6FF7A), then **reDeploy**,
  then a short tagline (— declarative, idempotent, verifiable deploys, sourced from the
  repo's own README/meta description) — ahead of the existing nav anchors
  (pipeline/studio/packages/github), which are preserved unchanged.
• Judgment call: dropped the reDeploy-specific chevron-mark SVG that used to sit at the
  start of the topbar. The family brand mark already anchors the statusbar directly above it
  (row 1), so a second logo in row 2 of the same sticky header read as redundant rather than
  reinforcing. The site's own nav is real, useful, and unique to this app, so it stays — it
  just now sits after the brand-book-compliant strip instead of interleaved with it.
• content.ts: centralized the glyph/tagline as TOPBAR, matching how NAV_LINKS and
  FOOTER are already content-driven (this repo keeps marketing copy out of JSX).
• styles.css: dropped the now-unused .mark rule (the SVG it styled is gone), added
  .tagline (dim, same treatment as the rest of the muted topbar text), and bolded .chev
  to match the family's subbar glyph weight (700).
• Tests: new Topbar.test.tsx asserts the row order (glyph → name → tagline) and that the
  nav anchors still resolve to the right hrefs; content.test.ts covers the new TOPBAR export.

Row 1's statusbar (from #166) is untouched — including its blinking amber cursor, which was
an intentional, already-reviewed refinement over the reference's static cursor (honors
prefers-reduced-motion), not something this PR revisits.

Verification

• pnpm install --prefer-offline — clean, from the committed lockfile.
• pnpm -F @redeploy/website typecheck — clean.
• pnpm -F @redeploy/website lint — clean (0 warnings, --max-warnings=0).
• pnpm -F @redeploy/website build (vite build) — succeeds.
• pnpm -F @redeploy/website test — 28/28 passing (5 test files).
• pnpm -F @redeploy/website coverage — 100% statements/functions/lines, 97.67% branches on
  the touched module — above the repo's 80% threshold.

Reference

• Source of truth: site/index.html in robercano/reCode (the .hdr/.statusbar/.subbar
  block).
• Reference implementation: recode.thesolidchain.com.

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