fix: improve responsive footer layout on mobile

[saurabhhhcodes]

Footer links overlap on mobile viewports. Add proper responsive breakpoints.

[saurabhhhcodes]

I'd like to work on this — contributing under GSSoC'26

[saurabhhhcodes]

I'd like to work on this issue. Please assign it to me.

[saurabhhhcodes]

/assign

[github-actions]

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