fix(stack): support request-aware page clients

[olliethedev]

Summary

• allow Next.js page and metadata factories to await request-aware stack clients using page props
• add a React Router loader factory that receives the request and router context while keeping render-time client access synchronous
• add a TanStack loader client resolver that can await router-context-aware clients while preserving synchronous component usage
• document the three framework patterns and cover them in unit and generated-app E2E fixtures

Validation

• pnpm lint
• pnpm build
• pnpm typecheck
• pnpm test (598 tests)
• docs production build
• Next.js generated-app E2E (150 passed, 34 skipped)
• React Router generated-app E2E (147 passed, 34 skipped)
• TanStack Start generated-app E2E (147 passed, 34 skipped)

Closes #162

[vercel]

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Project	Deployment	Actions	Updated (UTC)
better-stack-docs	Ready	Preview	Aug 22, 2026 12:50am
better-stack-playground	Ready	Preview	Aug 22, 2026 12:50am