Add privacy-friendly download and checkout attribution

[SeoFood]

Context

TypeWhisper needs aggregate insight into referral sources, selected download targets, and checkout starts while remaining cookieless and avoiding persistent visitor identifiers.

Changes

• Load Plausible only in production and send typed Download and Checkout Started events.
• Preserve campaign UTMs only for the current browser session and forward them to Polar checkout links.
• Track the main Mac, Windows, iOS, GitHub, Store, TestFlight, and Homebrew download paths.
• Add safe website attribution defaults for direct visits.
• Update the German and English privacy disclosures.
• Add unit and browser coverage for attribution and blocked-tracking navigation.

User impact

Download choices and checkout starts can be analyzed by source in Plausible, while Polar receives the same campaign attribution for completed purchases.

Test plan

• npm run test:unit
• npm run test:e2e
• npm run build
• npx astro check

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 6cc88ac0-56cf-4cb4-95d4-244f46b53f6b

📥 Commits

Reviewing files that changed from the base of the PR and between dd64e98 and 78ac143.

📒 Files selected for processing (24)

• package.json
• src/components/landing/download-cta.tsx
• src/components/landing/hero.tsx
• src/components/landing/platform-download-menu.tsx
• src/components/landing/platforms-coming-soon.tsx
• src/components/layout/header.tsx
• src/components/pricing/commercial-table.tsx
• src/components/pricing/supporter-section.tsx
• src/components/use-cases/use-case-cta.tsx
• src/components/use-cases/use-case-hero.tsx
• src/i18n/locales/de/privacy.json
• src/i18n/locales/en/privacy.json
• src/layouts/BaseLayout.astro
• src/lib/attribution.ts
• src/lib/platform-download.ts
• src/pages/[locale]/business.astro
• src/pages/[locale]/privacy.astro
• src/pages/[locale]/release-status.astro
• src/pages/docs/_ios.tsx
• src/pages/docs/mac/_installation.tsx
• src/pages/docs/windows/_installation.tsx
• src/pages/use-cases/_index.tsx
• tests/attribution.test.ts
• tests/download-routing.spec.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch seofood/privacy-friendly-attribution

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