fix(namespaces): fix member count

[ycdzj]

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[Copilot]

Pull Request Overview

This PR fixes the member count display for namespaces by changing the API endpoint from fetching the full member list to fetching just the count, improving performance and data handling.

• Updated the API endpoint from namespaces/${namespaceId}/members to namespaces/${namespaceId}/members/count
• Changed the data structure from an array of members to an object containing a count property
• Updated the UI component to access the count property instead of using array length

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/hooks/use-namespace-member.ts	Changed API endpoint to fetch member count instead of full member list and updated state type accordingly
src/page/sidebar/switcher/member.tsx	Updated to access count property from data object instead of array length

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