test: cover NotificationSection grouping and change forwarding

[AugistineCreates]

This pr closes #740

Description:
This PR adds dedicated RTL (React Testing Library) test coverage for the NotificationSection wrapper component, which was previously missing a specific unit test.

Changes included:

• Added src/components/settings/NotificationSection.test.tsx using vitest and @testing-library/react.
• Verified that the section correctly renders its grouped toggles along with the header and description.
• Ensured that toggling any child component properly invokes the section's change handler with the correct key.

Edge Cases Covered:

• Mixed states: Handled correctly when some preferences are toggled on and others off.
• All-on / All-off states: Verified that all toggles render in the correct state based on the provided preferences prop.
• Single toggle: Works seamlessly when only one child toggle is present.
• Empty preferences: Evaluated the fallback behavior to ensure it doesn't crash when preferences are empty.

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[1nonlypiece]

coverage on the notification section grouping and forwarding looks good, in