- Remove the standalone Pi Extensions section from settings navigation and route legacy initialSection values to Plugins
- Add accessible subsection tabs in Plugins for Fusion Plugins and Pi Extensions with proper tab/tabpanel semantics
- Render plugin content conditionally per active subsection so only the selected manager is mounted
- Add SettingsModal tests covering sidebar navigation, tab accessibility, and subsection switching behavior
- Add subsection styling in SettingsModal.css and preserve extracted styles.css boundaries
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