fix: keep dashboard action buttons visible on mobile (#1294)

[mittalsonal]

Description\n- make the dashboard action button row wrap cleanly on smaller screens\n- keep Year in Code, Settings, and export actions fully visible on mobile widths\n- update the export button group to cooperate with the wrapped mobile layout\n\n## Related Issue\n- Closes #1294\n\n## Checklist\n- [x] mobile-focused UI fix\n- [x] git diff --check passes\n- [x] change is scoped to dashboard action layout only\n\n## Pillar\n- Open Source\n

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[github-actions]

GSSoC Label Checklist 🏷️

@Priyanshu-byte-coder — please apply the appropriate labels before merging:

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• level:beginner — 20 pts
• level:intermediate — 35 pts
• level:advanced — 55 pts
• level:critical — 80 pts

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• quality:clean — ×1.2 multiplier
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[mittalsonal]

Kind request for GSSoC labels when reviewed: gssoc:approved, one level:* label, and ype:bug if it fits the repo’s scoring rubric. Thanks!

[mittalsonal]

Verification completed locally:

• git diff --check

This PR intentionally keeps the change small and limited to the dashboard action button layout plus the export button group's responsive behavior.

[github-actions]

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