Tabs need proper responsive font colors for buttons

[dcrjodle]

Summary

Tab buttons need to have proper responsive font colors that adapt appropriately based on context and state.

Additional Context

The issue appears to relate to font color contrast or visibility of tab button text in different states or responsive breakpoints.

Slack thread: https://ivy-interactive.slack.com/archives/C09PMA599RC/p1788200544068019?thread_ts=1788200544.068019&cid=C09PMA599RC

Reported by @rorychatt

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