chore: upgrade the visual reporter to React 19

[plum117]

Summary

Step 3 of the visual reporter upgrade: React 18 → 19 (replaces Dependabot #1264).

Depends on #1292 (React Router 7), which depends on #1291 (Vite 6). Their commits are included here; after they are merged, this PR shows only the React 19 commit.

Remix 2 accepted only React 18; React Router 7 accepts React 18 and 19. The other UI packages accept React 19 (react-select 5.10: ^16.8 || … || ^19.0, react-icons 5.7: *).

These are development dependencies of the reporter: they build the static report UI. Users do not install them.

Changes

• react, react-dom, @types/react, @types/react-dom: 18 → 19.3.
• app/types/index.ts: with @types/react 19, useRef<T>(null) returns RefObject<T | null>, so CanvasDrawingProps.canvasRef allows null. The drawing hook already checks canvasRef.current for null.

Test

• The built UI is pixel-identical: the demo report served on a fresh port and opened in headless Chrome (WebdriverIO), home view and comparison overlay: 0 different pixels compared with the Vite 5 / Remix build.
• The react-select filters work: the Status dropdown opens with "All", "Passed" and "Failed"; "Passed" shows 19 cards and "Failed" 17. No browser console errors.
• Reporter typecheck, pnpm test (1077 unit tests): pass. pnpm peers check: no React peer warning.

No changeset: development dependencies only, and the built UI does not change.

🤖 Generated with Claude Code

[changeset-bot]

⚠️ No Changeset found

Latest commit: 1eee45b

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[greptile-apps]

Confidence Score: 5/5

[High impact] The PR appears safe to merge; no actionable issues were found.

Summary

Upgrades the reporter UI to React 19.3, including the earlier Vite 6 and React Router 7 migration commits.

• The visual reporter builds a static report with React Router 7 and React 19.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  Config["React Router config: ssr false"] --> Build["react-router build"]
  Route["Dashboard index route"] --> Build
  Build --> Client["build/client"]
  Client --> CLI["CLI copies report files"]
  Client --> Pages["GitHub Pages publishes files"]
  CLI --> Browser["React 19 hydrates the report"]
  Pages --> Browser
  Browser --> Data["Fetch static/report/output.json"]

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_{Reviews (1) · Last reviewed commit: "chore: upgrade the visual reporter to Re..." · Reviewed by Greptile}