feat: add sidebar project search with highlight

[lionellc]

Adds a sidebar search with debounce and name highlighting to make large workspace lists easier to scan.

• Add a search input with clear action and debounced filtering for workspace groups
• Highlight matched workspace name fragments in search results
• Improve empty state messaging when no projects match the query

[Dimillian]

Good but IMO it should be a search icon (maybe aligned with project title?) that toggle the search bar on/off.
Right now it eat too much vertical of the sidebar

[lionellc]

Thanks for the review! I made a spacing adjustment and tied it to the search bar state (tighter when collapsed, a bit more space when expanded). I’m not 100% sure if this matches what you had in mind—could you please confirm whether this direction is what you want, or if you’d prefer a different interaction?

• [ x ] Reduced the vertical gap between “Projects” and the list
• [ x ] Made spacing dynamic for collapsed/expanded search
• [ ] Please confirm if this adjustment should stay (or suggest the target spacing)

Collapsed (search hidden)

Expanded (search shown)

[Dimillian]

better, I'm doing few fixes myself