Improve VoiceOver accessibility for file tree browser

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Summary

During review of !207844 (merged), VoiceOver testing revealed two accessibility issues with the file tree browser:

1. Multiple "loading" announcements: VoiceOver announces "loading loading loading loading" repeatedly when directories are being loaded. This should be announced only once for better user experience.

2. Additional information announced: VoiceOver announces additional information that's not visible in the UI. Need to verify if this is expected behavior or if it should be suppressed.

Context

• Parent issue: #541107
• Related MR: !207844 (merged)
• Review comment: !207844 (comment 2803857860)

Video

preview

Steps to reproduce

1. Enable the repository_file_tree_browser feature flag
2. Enable VoiceOver on macOS
3. Navigate to a repository and browse directories
4. Observe the VoiceOver announcements

Expected behavior

• Loading state should be announced once per loading operation
• Only visible UI information should be announced to screen readers

Labels

accessibility frontend groupsource code Category:Source Code Management typebug