Update settings view with Tailwind

[BojayL]

Summary

• Refactor the dashboard Settings subview from the CSS module to Tailwind utility classes.
• Keep account, email, phone, and profile sections responsive across desktop and mobile layouts.
• Preserve existing account/profile update behavior and wire the existing phone add state into the visible form controls.
• Remove the unused Settings CSS module and unused modal/import code.

Closes #55

Validation

• npm --workspace frontend run build
• yarn workspace frontend build
• Responsive browser check for /dashboard/setting with mocked user data
• git diff --check

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