fix(mcp): recover from page renderer crash

[yury-s]

Summary

• Tab marks itself crashed on the page 'crash' event.
• ensureTab() detects a crashed current tab, closes it, opens a fresh about:blank, and logs a synthetic console error so the LLM can see what happened.
• Non-current crashed tabs are surfaced with a [crashed] marker in browser_tabs list.

Fixes microsoft/playwright-mcp#1599

[github-actions]

Test results for "MCP"

22 failed
❌ [chrome] › mcp/crash.spec.ts:29 › crash recovery › resets to about:blank and logs the crash @mcp-ubuntu-latest-chrome
❌ [chrome] › mcp/crash.spec.ts:51 › crash recovery › lists only one tab @mcp-ubuntu-latest-chrome
❌ [chrome] › mcp/crash.spec.ts:65 › crash recovery › marks non-current crashed tab in the tab list @mcp-ubuntu-latest-chrome
❌ [chromium] › mcp/crash.spec.ts:29 › crash recovery › resets to about:blank and logs the crash @mcp-ubuntu-latest-chromium
❌ [chromium] › mcp/crash.spec.ts:51 › crash recovery › lists only one tab @mcp-ubuntu-latest-chromium
❌ [chromium] › mcp/crash.spec.ts:65 › crash recovery › marks non-current crashed tab in the tab list @mcp-ubuntu-latest-chromium
❌ [firefox] › mcp/dashboard.spec.ts:124 › daemon show: closing page exits the process @mcp-windows-latest-firefox
❌ [firefox] › mcp/dashboard.spec.ts:164 › should capture annotations via show --annotate @mcp-windows-latest-firefox
❌ [firefox] › mcp/dashboard.spec.ts:185 › should start dashboard and annotate when no dashboard is running @mcp-windows-latest-firefox
❌ [firefox] › mcp/dashboard.spec.ts:207 › should enter annotate mode on fresh dashboard.tsx mount with -s --annotate @mcp-windows-latest-firefox
❌ [firefox] › mcp/dashboard.spec.ts:231 › should annotate via direct browser_annotate MCP call @mcp-windows-latest-firefox
❌ [firefox] › mcp/dashboard.spec.ts:264 › should annotate when context has no fixed viewport @mcp-windows-latest-firefox
❌ [firefox] › mcp/dashboard.spec.ts:301 › should cancel browser_annotate when the MCP request is aborted @mcp-windows-latest-firefox
❌ [firefox] › mcp/dashboard.spec.ts:332 › should cancel browser_annotate when the MCP client disconnects @mcp-windows-latest-firefox
❌ [firefox] › mcp/dashboard.spec.ts:361 › should switch screencast to -s session on show --annotate @mcp-windows-latest-firefox
❌ [firefox] › mcp/dashboard.spec.ts:410 › should disengage annotate mode when --annotate client disconnects @mcp-windows-latest-firefox
❌ [firefox] › mcp/dashboard.spec.ts:477 › save recording streams WebM bytes to the chosen file @mcp-windows-latest-firefox
❌ [msedge] › mcp/dashboard.spec.ts:207 › should enter annotate mode on fresh dashboard.tsx mount with -s --annotate @mcp-windows-latest-msedge
❌ [msedge] › mcp/http.spec.ts:103 › http transport browser lifecycle (isolated) @mcp-windows-latest-msedge
❌ [msedge] › mcp/http.spec.ts:142 › http transport browser sigint @mcp-windows-latest-msedge
❌ [webkit] › mcp/dashboard.spec.ts:231 › should annotate via direct browser_annotate MCP call @mcp-windows-latest-webkit
❌ [webkit] › mcp/dashboard.spec.ts:264 › should annotate when context has no fixed viewport @mcp-windows-latest-webkit

6888 passed, 1046 skipped

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Merge workflow run.