Implement PostHog website analytics foundation

[f-gueguen]

Summary

• Why: M6.5.21 needs a privacy-heavy PostHog website foundation plus Phase 2/3 vocabulary alignment so backend-produced product events, dashboard actions, and browser/server error tracking remain useful without raw PII or customer content.
• What: Added/updated analytics event catalog entries, dashboard page-crawl wiring, route-aware app-surface classification for exceptions/pageviews, safe current-url reconstruction for local/non-HTTPS app URLs, stable crawl-failure action metadata, semantic query dedupe for pageviews and site-scoped dashboard views, PostHog proxy failure telemetry, instant dashboard error retry capture, checkout/webhook/waitlist exception surface metadata, backend action-failure vocabulary sync, backend docs sync metadata, and PostHog analytics contract docs.

Testing

• corepack pnpm test (Not run; targeted analytics/dashboard suites plus contracts were run instead.)
• corepack pnpm check
• corepack pnpm test:contracts
• WEBLINGO_REPO_PATH=/Users/francoisgueguen/Documents/workspaces-self/saas/weblingo corepack pnpm docs:sync:check
• Other: corepack pnpm vitest --run internal/analytics/events.test.ts internal/analytics/server.test.ts internal/analytics/envelope.test.ts
• Other: corepack pnpm vitest --run components/dashboard/action-form.test.tsx app/dashboard/actions.capabilities.test.ts internal/analytics/events.test.ts app/dashboard/sites/[id]/pages/page.test.tsx internal/analytics/client.test.ts internal/analytics/envelope.test.ts internal/analytics/server.test.ts
• Other: corepack pnpm vitest --run components/navigation-analytics-tracker.test.tsx components/dashboard/site-analytics-scope.test.tsx app/dashboard/error.test.tsx app/api/stripe/create-checkout-session/route.test.ts internal/analytics/navigation.test.ts
• Other: corepack pnpm vitest --run app/api/analytics/posthog/[[...path]]/route.test.ts app/api/stripe/webhook/route.test.ts app/api/waitlist/route.test.ts internal/analytics/events.test.ts internal/analytics/envelope.test.ts

Docs sync and capability matrix

• Updated docs/backend/DASHBOARD_SPECS.md if user-facing backend capability coverage changed. (N/A; analytics contract only.)
• Ran WEBLINGO_REPO_PATH=/Users/francoisgueguen/Documents/workspaces-self/saas/weblingo corepack pnpm docs:sync and committed content/docs/_generated/* when backend HEAD advanced.

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Project	Deployment	Actions	Updated (UTC)
weblingo-website	Error		Jun 7, 2026 9:21am