fix: add visible focus ring on all interactive elements

[saurabhhhcodes]

Ensure all buttons, links, and inputs have a visible focus ring for keyboard accessibility.

[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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