refactor: Move timeline state from Workflow History header to root

[adhityamamallan]

Summary

Lift timeline state up from WorkflowHistoryHeader to WorkflowHistoryV2, allowing sub-components in the list to open the timeline if necessary.

Test plan

Updated unit tests.

[Copilot]

Pull request overview

This PR lifts the “timeline shown” state from WorkflowHistoryHeader up into WorkflowHistoryV2, so components outside the header can control timeline visibility.

Changes:

• Introduced isTimelineShown state in WorkflowHistoryV2 and passed it down to WorkflowHistoryHeader.
• Updated WorkflowHistoryHeader props/types to accept isTimelineShown + setIsTimelineShown instead of owning local state.
• Adjusted WorkflowHistoryHeader unit tests to reflect externally-controlled timeline state.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
src/views/workflow-history-v2/workflow-history-v2.tsx	Adds timeline visibility state at the page/root level and passes it into the header.
src/views/workflow-history-v2/workflow-history-header/workflow-history-header.types.ts	Extends header props to include timeline state + setter.
src/views/workflow-history-v2/workflow-history-header/workflow-history-header.tsx	Removes internal timeline state and uses the injected state/setter.
src/views/workflow-history-v2/workflow-history-header/__tests__/workflow-history-header.test.tsx	Updates tests for the new controlled-timeline behavior.

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[Copilot]

This assertion only checks that setIsTimelineShown was called, but not that it was called with the expected toggle updater. Since the handler uses the functional form ((v) => !v), consider asserting the argument is a function (or invoking it to verify it toggles) to make the test actually validate the behavior.

Suggested change

	expect(mockSetIsTimelineShown).toHaveBeenCalledTimes(1);
	expect(mockSetIsTimelineShown).toHaveBeenCalledTimes(1);
	const toggleUpdater = mockSetIsTimelineShown.mock.calls[0][0];
	expect(typeof toggleUpdater).toBe('function');
	expect(toggleUpdater(true)).toBe(false);
	expect(toggleUpdater(false)).toBe(true);