Share popover total count

[ericokuma]

Fixes APP-524: The project share popover now displays the correct total user count.

Previously, the popover would only show up to 20 users because it was relying on the length of a paginated API response. This change introduces a totalCount field to the ListUsergroupMemberUsers API endpoint and updates the frontend components (GeneralAccessSelectorDropdown.svelte, ShareProjectForm.svelte) to use this new field for accurate user counts.

Checklist:

• Covered by tests
• Ran it and it works as intended
• Reviewed the diff before requesting a review
• Checked for unhandled edge cases
• Linked the issues it closes
• Checked if the docs need to be updated. If so, create a separate Linear DOCS issue
• Intend to cherry-pick into the release branch
• I'm proud of this work!

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Linear Issue: APP-524

 

[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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