fix(dashboard): interactive clicks with remote browsers and screencast freeze

[Ishita-Jinturkar]

Bug 1: Interactive clicks don't work with remote browsers

Summary: Dashboard interactive clicks go to (0,0) instead of intended coordinates when using connectOverCDP(), Android, or iOS remote debugging.

Root Cause: Remote browsers intentionally set viewport: null to avoid interfering with the browser's natural viewport. When Dashboard calls page.viewportSize(), it returns null, causing the coordinate mapping function clientToViewport() to receive 0×0 dimensions and always map clicks to the top-left corner.

Reproduction Steps:

1. Start a Chrome/Edge browser with remote debugging enabled:

chrome --remote-debugging-port=9222

2.Run Playwright Dashboard and connect over CDP:

npx playwright open --headed --browser chromium --remote-debugging-port=9222

Open Dashboard in interactive mode
Try to click any element on the page
Expected: Click happens at the clicked location
Actual: Click always happens at (0,0) - top-left corner

User impact:

Interactive mode features fail: generate locator, hover, highlight, mouse events, keyboard events, fill, type, check, uncheck, select
Only scrolling works (doesn't require coordinate transformation)
Workaround: Manually resizing the viewport makes it work temporarily

Change: Modified the _startScreencast() method to detect viewport size once before streaming starts.

[github-actions]

Test results for "MCP"

3 failed
❌ [chrome] › mcp/autowait.spec.ts:19 › racy navigation destroys context @mcp-windows-latest-chrome
❌ [webkit] › mcp/http.spec.ts:103 › http transport browser lifecycle (isolated) @mcp-windows-latest-webkit
❌ [webkit] › mcp/http.spec.ts:142 › http transport browser sigint @mcp-windows-latest-webkit

6901 passed, 1052 skipped

---

Merge workflow run.

[github-actions]

Test results for "tests 1"

4 flaky

⚠️ [chromium-library] › library/video.spec.ts:682 › screencast › should capture full viewport on hidpi `@chromium-ubuntu-22.04-arm-node20`
⚠️ [chromium-library] › library/video.spec.ts:719 › screencast › should work with video+trace `@chromium-ubuntu-22.04-node24`
⚠️ [chromium-library] › library/video.spec.ts:719 › screencast › should work with video+trace `@chromium-ubuntu-22.04-node20`
⚠️ [webkit-page] › page/page-set-input-files.spec.ts:38 › should upload a folder `@webkit-ubuntu-22.04-node20`

41619 passed, 850 skipped

---

Merge workflow run.

[pavelfeldman]

I'll accept this but only this change, the rest seem to be noop.

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