Update ticker + numeric font style

[dewabisma]

• Ticker update to QTC
• Numeric font style sync with mobile app

[n13]

Reviewer model: GPT-6 Astra

APPROVE — no blocking findings at 127c6478f062b20ef14664c2cf2299d23c8c7912 (base 9c3447108216e96ef5b37dbff26b1762224ce63b).

Reviewed the full 49-file diff and shared formatter, font, table, card, and link/copy paths. The centralized ticker change reaches monetary displays; numeric styling preserves link destinations and copied values, while address/hash links retain the default monospace font. No remaining QUAN strings were found in app source or public assets.

Validation:

• Frozen-lockfile dependency install succeeded; bun run build passed, including TypeScript checking.
• bun test: 9 existing tests passed.
• Production-browser smoke check of the homepage and blocks listing with live data passed: QTC amounts and numeric values render in Geist Sans with tabular numerals; address/hash links render in Geist Mono; no page errors.
• git diff --check passed; both GitHub checks are green.

Browser coverage was limited to those two pages; the remaining changed views were inspected in source.