fix: improve light theme visibility for dashboard and subscription cards

- Increase card opacity and shadow contrast in glassTheme for light mode
- Add accent-tinted borders and shadows to subscription cards (active, expired, trial)
- Fix grid patterns to use dark lines instead of white in light mode
- Fix trial CTA button: solid green with dark text instead of invisible transparent
- Fix trial icon background: light accent gradient instead of hardcoded dark
- Add + prefix to referral earnings in StatsGrid

src/components/dashboard/SubscriptionCardActive.tsx

@@ -73,9 +73,11 @@ export default function SubscriptionCardActive({
         background: g.cardBg,
         border: subscription.is_trial
           ? '1px solid rgba(62,219,176,0.15)'
-          : `1px solid ${g.cardBorder}`,
+          : isDark
+            ? `1px solid ${g.cardBorder}`
+            : `1px solid ${zone.mainHex}25`,
         padding: '28px 28px 24px',
-        boxShadow: g.shadow,
+        boxShadow: isDark ? g.shadow : `0 2px 16px ${zone.mainHex}12, 0 0 0 1px ${zone.mainHex}08`,
       }}
     >
       {/* Trial shimmer border */}