fix: extract badge URL to shared constant and improve markdown export handling

components/dashboard/ShareSheet.tsx

@@ -15,6 +15,7 @@ import { Check, Code, Copy, Download, ExternalLink, Loader2, Sparkles, X } from
 import type { DashboardExportData } from '@/types/dashboard';
 import { useShareActions } from '@/hooks/useShareActions';
 import { useTranslation } from '@/context/TranslationContext';
+import { SITE_URL } from '@/lib/constants';
 
 type OptionState = 'idle' | 'loading' | 'success' | 'error';
 
@@ -147,7 +148,7 @@ export default function ShareSheet({ username, isOpen, onClose, exportData }: Sh
   const [mdCopied, setMdCopied] = useState(false);
   const [toast, setToast] = useState<{ msg: string; id: number } | null>(null);
 
-  const profileUrl = `https://commitpulse.vercel.app/dashboard/${username}`;
+  const profileUrl = `${SITE_URL}/dashboard/${username}`;
 
   const handleWhatsApp = () => {
     const text = encodeURIComponent(profileUrl);

hooks/useShareActions.ts

@@ -3,8 +3,9 @@ import { copyToClipboard } from '@/utils/clipboard';
 import { useState, useRef, useEffect } from 'react';
 import { toPng, toCanvas } from 'html-to-image';
 import type { DashboardExportData } from '@/types/dashboard';
-import { getDashboardUrl, getOrigin } from '@/utils/urls';
+import { getDashboardUrl } from '@/utils/urls';
 import { activityToTowers, generateMonolithSTL } from '@/lib/export3d';
+import { BADGE_BASE_URL } from '@/lib/constants';
 
 type OptionState = 'idle' | 'loading' | 'success' | 'error';
 
@@ -45,7 +46,7 @@ function sanitizeFilenameSegment(value: string): string {
 }
 
 function buildStreakSvgUrl(username: string): string {
-  const url = new URL('/api/streak', getOrigin());
+  const url = new URL(BADGE_BASE_URL);
   url.searchParams.set('user', sanitizeUsernameForUrl(username));
   return url.toString();
 }

lib/constants.ts

@@ -0,0 +1,2 @@
+export const SITE_URL = 'https://commitpulse.vercel.app';
+export const BADGE_BASE_URL = `${SITE_URL}/api/streak`;