Fix top navigation Public Workspace crash

[Paul Lizer (paullizer)]

Summary

• Initialize public_workspace_labels before the top navigation renders, preventing the Jinja UndefinedError triggered by a saved navLayout: "top" preference when Public Workspaces is enabled.
• Add deterministic template-render regression coverage and strengthen the authenticated top-navigation browser workflow.
• Merge the latest Development, resolve the application version at 0.250.196, and add fix documentation and release notes.

Validation

• python functional_tests/test_public_workspace_display_name_settings.py (4/4 passed)
• python functional_tests/test_admin_settings_sidebar_card_parity.py (4/4 passed after merging Development)
• python -m py_compile functional_tests/test_public_workspace_display_name_settings.py ui_tests/test_chat_sidebar_toggle_controls.py functional_tests/test_admin_settings_sidebar_card_parity.py ui_tests/test_admin_settings_sidebar_card_navigation.py
• git -c core.whitespace=blank-at-eol,blank-at-eof,space-before-tab,cr-at-eol diff --check
• Targeted authenticated Playwright test collected successfully; skipped locally because UI base URL and storage state were not configured.