fix(trace-viewer): align library and runner clocks by wall time

[pavelfeldman]

Summary

• Library contexts running in a different process from the test runner (e.g. APIRequestContext over a remote run-server in Docker) have an unrelated monotonic clock.
• The stepId-match alignment returned 0 when no action was shared, leaving the timeline to span the gap between the two process uptimes (often hours).
• Compute the delta from the wallTime/monotonicTime pair recorded in each context-options event; fall back to stepId matching only for older traces.

Fixes #40068

[github-actions]

Test results for "MCP"

2 failed
❌ [firefox] › mcp/cli-test.spec.ts:23 › debug test and snapshot @mcp-windows-latest
❌ [chrome] › mcp/cli-keyboard.spec.ts:19 › press @mcp-macos-latest

6440 passed, 383 skipped

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Merge workflow run.

[github-actions]

Test results for "tests 1"

1 failed
❌ [playwright-test] › ui-mode-test-network-tab.spec.ts:397 › should not preserve selection across test runs @macos-latest-node20

4 flaky

⚠️ [chromium-library] › library/video.spec.ts:342 › screencast › should work for popups `@chromium-ubuntu-22.04-arm-node20`
⚠️ [chromium-library] › library/video.spec.ts:724 › screencast › should work with video+trace `@chromium-ubuntu-22.04-arm-node20`
⚠️ [chromium-library] › library/video.spec.ts:118 › screencast › should capture static page `@chromium-ubuntu-22.04-node24`
⚠️ [chromium-page] › page/page-request-continue.spec.ts:754 › propagate headers cross origin redirect after interception `@chromium-ubuntu-22.04-node20`

39142 passed, 846 skipped

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Merge workflow run.