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

[jikkai]

Pull Request Checklist

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

[codecov]

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 ⚠️
packages/slides/src/views/render/canvas-view.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           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]

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