fix(a11y): increase sm and icon button touch targets to 44x44px (#243)

[arpita-1111]

Linked issue

Closes #243

What this PR does

Increases the touch target size of the sm and icon button variants to meet WCAG 2.2 Success Criterion 2.5.8 (Target Size - Minimum). Previously these variants were smaller than the recommended 44x44 CSS pixels, making them harder to interact with on touch-enabled devices.

Type of change

• Bug fix
• New feature
• ML model / training pipeline
• Refactor (no behaviour change)
• Documentation
• Tests only
• Accessibility fix

Stack affected

• Backend
• Frontend
• Both

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Changes

Frontend

• Updated frontend/src/app/components/ui/button.tsx.
• Changed sm variant height from h-8 (32px) to h-11 (44px).
• Changed icon variant size from size-9 (36px) to size-11 (44px).
• Existing visual style, padding, and layout preserved.

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Testing

How did you test this?

• Ran the frontend locally with npm run dev.
• Visually inspected the sidebar navigation, dashboard buttons, and icon-only controls.
• Confirmed buttons remain visually consistent with the design system after the size increase.

Checklist

• Tested locally end-to-end (visual check of sm/icon buttons across the app)
• No new console errors or unhandled exceptions introduced
• Added or updated tests where applicable
• New dependencies added
• No new model files added

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Anything reviewers should focus on

Please confirm the sm and icon button variants render correctly across different pages (sidebar, toolbar, dashboard) and that no layouts break due to the increased touch target size.

Screenshots (if UI changed)

Sidebar navigation buttons (Dashboard, Findings, Fixes, Verify, Leaderboard) and Light mode toggle now render at increased touch target size, confirmed visually in local dev environment.

[github-actions]

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