fix: replace mojibake UTC disclaimer prefix in dashboard stats card (JhaSourav07#2219)

## Description
This PR fixes the broken UTC disclaimer prefix in
`components/dashboard/StatsCard.tsx` by replacing the mojibake-rendered
decorative prefix with a clean info symbol. It keeps the existing
disclaimer copy and UTC date rendering intact, and adds a focused
regression test for the disclaimer output.

Fixes JhaSourav07#2218

## Pillar
UI polish and accessibility improvements

## Checklist
- [x] I read the contributing guide
- [x] I kept the change small and focused
- [x] I added a focused regression test
- [x] I ran local tests
- [x] I ran linting for the touched files
- [ ] I verified Vercel deployment (maintainer authorization required on
this repo)

## Testing
- `npm test -- StatsCard.test.tsx`
- `npx eslint components/dashboard/StatsCard.tsx
components/dashboard/StatsCard.test.tsx`

Author: JhaSourav07

components/dashboard/StatsCard.tsx

@@ -65,7 +65,7 @@ export default function StatsCard({
           {showUTCDisclaimer && (
             <div className="mt-3 space-y-1">
               <p className="text-[11px] text-[#71717A] leading-relaxed">
-                ℹ Streaks are calculated in UTC and may differ from your local timezone.
+                ℹ Streaks are calculated in UTC and may differ from your local timezone.
               </p>
 
               {utcDate && <p className="text-[10px] text-[#52525B]">UTC Date: {utcDate}</p>}

components/dashboard/StatsCard.utc-disclaimer.test.tsx

@@ -0,0 +1,41 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+import { describe, expect, it, vi } from 'vitest';
+import { render } from '@testing-library/react';
+import StatsCard from './StatsCard';
+
+vi.mock('framer-motion', () => ({
+  motion: {
+    div: ({ children, className, ...props }: any) => {
+      delete props.initial;
+      delete props.whileInView;
+      delete props.viewport;
+      delete props.whileHover;
+      delete props.transition;
+
+      return (
+        <div className={className} {...props}>
+          {children}
+        </div>
+      );
+    },
+  },
+}));
+
+describe('StatsCard UTC disclaimer', () => {
+  it('renders a clean UTC disclaimer prefix and preserves the UTC date text', () => {
+    const { container } = render(
+      <StatsCard
+        title="Current Streak"
+        value="12"
+        description="Consecutive contribution days"
+        icon="Flame"
+        showUTCDisclaimer
+        utcDate="2026-06-01"
+      />
+    );
+
+    expect(container.textContent).toContain('ℹ');
+    expect(container.textContent).not.toContain('\u00E2\u20AC\u2039');
+    expect(container.textContent).toContain('UTC Date: 2026-06-01');
+  });
+});