show +N indicator for hidden organizations on hover

[jikrana1]

Addressed Issues:

Fixes #190

Recordings:

OrgExplorer.GitHub.Organization.Analytics.Repository.Insights.and.2.more.pages.-.Profile.1.-.Microsoft.Edge.2026-08-23.13-36-12.-.Trim.mp4

Additional Notes:

Added a "+N" indicator in the Overview identity bar to show how many organizations are hidden when more than 3 are searched together.

Changes:

• Added showAllOrgs state to track hover expansion
• Each avatar is wrapped in a container with animated width (0 to 36px) so hidden avatars take up no space in the layout, avoiding
  gaps
• Hovering over the avatar group smoothly reveals all organization avatars via a CSS width transition; moving the mouse away collapses back to 3 avatars + the "+N" badge
• The "+N" badge itself is also width-animated, so it fades away cleanly when expanded, without leaving a gap
• Added cursor: pointer on the avatar group when more than 3 organizations are present, to signal it's interactive
• The badge only renders when orgs.length > 3, so single or few-org searches are unaffected

Tested locally with 4-5 organizations searched together — hover expand/collapse works smoothly with no layout shift or gaps.

Checklist

• My code follows the project's code style and conventions
• I have made corresponding changes to the documentation
• My changes generate no new warnings or errors
• I have joined the Discord server and I will share a link to this PR with the project maintainers there
• I have read the Contributing Guidelines

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