Add Query Insights Studio view

[sorenbs]

Summary

• Adds the host-provided Query Insights Studio view, including prisma-log stream ingestion with initial snapshot replay plus live SSE follow, charted latency/QPS metrics, table filtering/sorting, pause buffering, and the right-side AI recommendation sheet.
• Wires the ppg-dev demo to ensure and append every successful SQL execution into the prisma-log stream, with Studio system queries classified via visibility metadata instead of filtered out.
• Makes stream event time rendering understand ts epoch fields, so prisma-log rows show real relative/exact times in the Streams view.
• Adds Query Insights architecture docs, feature docs, changeset, URL state, navigation/command palette integration, and focused coverage.
• Includes two review fixes needed for local CI signal: current @prisma/dev runtime assets no longer include pglite-seed.tar.gz, and the TanStack DB architecture allowlist now includes the existing stream-events collection boundary.

Validation

• git diff --check
• pnpm typecheck
• pnpm build
• COREPACK_ENABLE_STRICT=0 pnpm check:exports
• pnpm test:data
• pnpm test:demo
• pnpm test:checkpoint
• pnpm exec vitest --project release
• NODE_OPTIONS=--max-old-space-size=8192 pnpm exec vitest --passWithNoTests --project ui --maxWorkers=2 --exclude ui/studio/views/table/ActiveTableView.filtering.test.tsx
• git ls-files -m -o --exclude-standard | rg '\.(ts|tsx)$' | xargs pnpm exec eslint (warnings only from existing data/query.ts any usage)
• pnpm test demo/ppg-dev/query-insights.test.ts ui/studio/views/query-insights/codecs.test.ts ui/studio/views/query-insights/rows.test.ts
• pnpm exec eslint demo/ppg-dev/query-insights.ts demo/ppg-dev/query-insights.test.ts ui/studio/views/query-insights/types.ts ui/studio/views/query-insights/codecs.ts ui/studio/views/query-insights/codecs.test.ts ui/studio/views/query-insights/rows.ts ui/studio/views/query-insights/rows.test.ts
• pnpm test ui/studio/views/query-insights/use-query-insights-stream.test.tsx ui/studio/views/query-insights/codecs.test.ts ui/studio/views/query-insights/rows.test.ts ui/hooks/use-stream-events.test.tsx demo/ppg-dev/query-insights.test.ts
• pnpm exec eslint ui/studio/views/query-insights/use-query-insights-stream.ts ui/studio/views/query-insights/use-query-insights-stream.test.tsx ui/hooks/use-stream-events.ts ui/hooks/use-stream-events.test.tsx
• pnpm test ui/studio/views/query-insights/QueryInsightsView.test.tsx ui/studio/views/query-insights/use-query-insights-stream.test.tsx
• pnpm demo:ppg, then POST /api/query with meta.visibility = "studio-system" and GET /api/streams/v1/stream/prisma-log?format=json&offset=-1 to verify Studio system executions are appended with visibility: "studio-system".
• Playwright smoke against http://localhost:4310/#view=query-insights verified Query Insights populates immediately from the existing prisma-log snapshot.
• Playwright smoke against http://localhost:4310/#stream=prisma-log&view=stream verified ts-backed rows render relative/exact times instead of Unknown time.
• Playwright smoke was run during implementation for Query Insights stream ingestion, charts, table corner, select font, and AI detail sheet.

Notes

A full all-project pnpm test run was attempted after stopping the demo server. It progressed through the suite but the existing ui/studio/views/table/ActiveTableView.filtering.test.tsx file spins a Vitest worker into high CPU/heap when run as a whole. The changed Query Insights/UI/data/demo/release/checkpoint paths pass with the targeted commands above.

[github-actions]

Compute preview deployed.

Branch: codex/query-insights-studio-port
Service: codex-query-insights-studio-port
Preview: https://cmoqqnxr717aj08dung4v9jsv.cdg.prisma.build
Version: https://cv-3b4dac2399b4.cdg.prisma.build