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/StatsGrid.tsx

@@ -83,7 +83,7 @@ export default function StatsGrid({
       label: t('dashboard.stats.referrals'),
       value: `${referralCount}`,
       valueColor: g.text,
-      subtitle: `${formatAmount(earningsRubles)} ${currencySymbol}`,
+      subtitle: `+${formatAmount(earningsRubles)} ${currencySymbol}`,
       subtitleColor: zone.mainHex,
       to: '/referral',
       icon: (color: string) => (