Add label structure navigator

[level09]

Summary

• add a searchable, read-only label tree to the app bar for Admin, Mod, and DA users
• include Arabic titles and entity availability indicators while keeping label management restricted to Admin and Mod

Tests

• uv run pytest -q (867 passed, 4 skipped)

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/label-structure-navigator

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[apodacaduron]

Works well, just noticed something unrelated to this PR, im unable to edit existing Labels since it says

[path]: Extra field not allowed
[path_ar]: Extra field not allowed

[level09]

Thanks @apodacaduron good catch, addressed