(feat): add private mix history

[kyeunga25]

Summary

• add a bounded owner-scoped recent job collection with minimal summaries
• add a bilingual lazy-loaded dashboard that opens only the selected private job
• preserve existing upload, credit, provider, and generation boundaries
• add contract, repository, Worker, client, build-budget, and Chromium coverage

Verification

• pnpm format
• pnpm typecheck
• pnpm lint
• pnpm test:unit
• pnpm test:api
• pnpm test:local-ai
• pnpm test:e2e
• pnpm build
• pnpm public-config:check
• pnpm audit --audit-level=high
• pnpm audit --prod --audit-level=high
• git diff --check

Release boundaries

• no database migration
• no dependency or public Cloudflare configuration change
• no provider, payment, retention, or production generation flag change
• synthetic fixtures only; no user data, audio, credentials, or deployment identifiers

[cloudflare-workers-and-pages]

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	studymix-ai	8d3d3e2	Aug 20 2026, 11:14 PM