fix(Unit Plan): Zoom to and highlight previous step

[hirokiterashima]

Please style as you see fit.

Changes

• When going to the unit plan, zoom to the previous step and highlight it

Test

• above works as described

[qltysh]

Coverage Impact

Unable to calculate total coverage change because base branch coverage was not found.

Modified Files with Diff Coverage (1)

Rating	File	% Diff	Uncovered Line #s
	src/assets/wise5/vle/nav-item/nav-item.component.ts	0.0%	60-62
	Total	0.0%

🤖 Increase coverage with AI coding...

In the `zoom-highlight-nav-item` branch, add test coverage for this new code:

- `src/assets/wise5/vle/nav-item/nav-item.component.ts` -- Line 60-62

🚦 See full report on Qlty Cloud »

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• Diff Coverage: Coverage for added or modified lines of code (excludes deleted files). Learn more.

• Total Coverage: Coverage for the whole repository, calculated as the sum of all File Coverage. Learn more.

• File Coverage: Covered Lines divided by Covered Lines plus Missed Lines. (Excludes non-executable lines including blank lines and comments.)

  • Indirect Changes: Changes to File Coverage for files that were not modified in this PR. Learn more.