fix: add hideTrendIcon prop to StatCard for non-numeric trends (#158)

[devin-ai-integration]

Summary

Fixes ANYTECHS#158 — StatCard was always rendering a TrendingUp or TrendingDown icon next to the trend text. On the Earnings page, the "Pending Payout" and "Tax Ready" cards use non-numeric trend strings ("Processing" and "Exportable"), making the trend icon visually misleading.

Changes:

• Added an optional hideTrendIcon boolean prop to StatCard (defaults to false)
• When hideTrendIcon is true, no TrendingUp/TrendingDown icon is rendered — only the trend text is shown
• Applied hideTrendIcon to the "Pending Payout" and "Tax Ready" stat cards on the Earnings page
• Existing stat cards with numeric trends (e.g. +12.5%, +8.2%) are unaffected

Review & Testing Checklist for Human

• Navigate to the Earnings page and verify "Pending Payout" shows Processing without a trend icon
• Verify "Tax Ready" shows Exportable without a trend icon
• Verify "Total Earned" and "Completed" cards still show their trend icons (TrendingUp)
• Navigate to the Dashboard page and verify the 3 stat cards there still render trend icons as before

Notes

Minimal, targeted change — only 2 files modified. No new dependencies introduced.

Link to Devin session: https://app.devin.ai/sessions/6c8be1f0e8244898a5cd734f2bdc92c1
Requested by: @ZuLu0890

[devin-ai-integration]

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