feat: improve dev error overlay source frames

[hyoban]

Summary

• map dev overlay stack frames to original source files via the dev server source-map endpoint, including local server/RSC frames
• show project-relative paths, code frames, and Vite open-in-editor actions in the vinext overlay
• hide ignore-listed stack frames by default with a toggle to reveal them
• surface initial dev server errors in the browser overlay by installing it before App Router and Pages Router hydration and replaying serialized server errors
• disable Vite's built-in HMR overlay so vinext owns the dev error UI
• add a copy error info action that copies the error type, message, visible stack, code frame, and component stack when available
• fix App Router dev overlay recovery when server/RSC HMR toggles a throw in a server component or layout, including the document-level __next_error__ recovery path
• polish overlay layout, light mode, scrollbar styling, transparent backdrop, and width

Tests

• npx vp check packages/vinext/src/server/dev-error-overlay.tsx packages/vinext/src/server/dev-error-overlay-store.ts packages/vinext/src/server/dev-stack-sourcemap.ts tests/app-browser-entry.test.ts tests/dev-stack-sourcemap.test.ts tests/dev-initial-server-error.test.ts
• npx vp test run tests/app-browser-entry.test.ts tests/dev-stack-sourcemap.test.ts tests/dev-initial-server-error.test.ts
• vp run vinext#build
• PLAYWRIGHT_PROJECT=app-router npx playwright test tests/e2e/app-router/dev-error-overlay.spec.ts -g "HMR updates"
• PLAYWRIGHT_PROJECT=app-router npx playwright test tests/e2e/app-router/dev-error-overlay.spec.ts

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/vinext@1746

commit: fcbd449

[james-elicx]

/bigbonk review

[james-elicx]

/bigbonk review

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[james-elicx]

/bigbonk review

[james-elicx]

Ran this through some review passes locally since Bonk can't handle large PRs and nothing major came out, and skimming the diff looks reasonable, so happy to merge it once you're finished.

[hyoban]

I have nothing else to change. I've run local tests, and the behavior is acceptable. If any issues arise after the merge, please let me know, and I'll fix them.