Add TestFlight information page at /testflight

[Copilot]

Adds a public /testflight page for the Damus iOS beta program, and surfaces a link to it on the home page for iOS visitors.

New page: /testflight

• Hero – Damus branding + "TestFlight" heading, subheadline, primary "Join the Beta" CTA (→ https://testflight.apple.com/join/CLwjLxWl), secondary App Store link, "Join Beta" button injected into the top nav via customCTA
• Benefits – Three cards: Early Access, Shape the App, Free & Open Source
• How to Join – Numbered steps with inline bold highlights via a BoldText helper component; repeated CTA at the bottom
• Follows existing page structure (Notedeck/Android pattern): src/pages/testflight/index.tsx wires up IntlProvider, src/components/pages/testflight.tsx holds the component tree

Home page

Added a "Try the beta on TestFlight" secondary link below the App Store CTA in Hero.tsx, conditional on platform === 'ios':

{platform === 'ios' && (
  <Link href="/testflight">
    <Button variant="link" className="w-full md:w-auto text-sm">
      {intl.formatMessage({ id: "home.hero.testflight_beta", defaultMessage: "Try the beta on TestFlight" })}
      <ChevronRight className="ml-1 h-4 w-4" />
    </Button>
  </Link>
)}

Constants

DAMUS_TESTFLIGHT_URL added to src/lib/constants.ts.

Screenshot

Warning

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Original prompt

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This section details on the original issue you should resolve

<issue_title>Implement simple TestFlight information page</issue_title>
<issue_description>Implement and integrate simple TestFlight information page:

• Make a simple testflight information page under /testflight. Please try to roughly follow either the notedeck download page or the purple account page.
• If possible, add a small mention or link to this page on the home page, wherever you find appropriate.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Implement simple TestFlight information page #49

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