feat(slides): add sidebar highlighting for selected items in slides

[jikkai]

Pull Request Checklist

• [x] Related tickets or issues have been linked in the PR description (or missing issue).
• [x] Naming convention is followed (do please check it especially when you created new plugins, commands and resources).
• [x] Unit tests have been added for the changes (if applicable).
• [x] Breaking changes have been documented (or no breaking changes introduced in this PR).

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 47.05882% with 9 lines in your changes missing coverage. Please review.

Project coverage is 26.92%. Comparing base (a2fd4ed) to head (83019fa).

Files	Patch %	Lines
...ackages/slides-ui/src/views/slide-bar/SlideBar.tsx	0.00%	7 Missing :warning:
packages/slides/src/views/render/canvas-view.ts	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #2691 +/- ## ======================================= Coverage 26.92% 26.92% ======================================= Files 1636 1636 Lines 87997 88008 +11 Branches 18554 18554 ======================================= + Hits 23695 23699 +4 - Misses 64302 64309 +7 ```

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[github-actions[bot]]

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