fix(stats): open game detail pages from stat lists, perfect games clickable

Add perfect games click-through on the dashboard. Remove Steam store
links from game lists. Stat numbers with count 0 are not clickable.
Tests cover the perfect-games click, zero guards, and owner versus
visitor behavior.

src/components/SteamGameCount.jsx

@@ -6,6 +6,7 @@ import {ArrowRight, Gamepad2} from 'lucide-react';
 import {Card} from '@/components/ui/card';
 
 const DURATION_MS = 1000;
+const COUNT_CLASS = 'block text-5xl font-bold tracking-tight tabular-nums';
 
 const SteamGameCount = ({targetCount}) => {
     const {t} = useTranslation();
@@ -33,7 +34,9 @@ const SteamGameCount = ({targetCount}) => {
                 <Gamepad2 className="size-5"/>
             </div>
             <div>
-                <Link to="/library" className="block text-5xl font-bold tracking-tight tabular-nums hover:text-primary">{count}</Link>
+                {targetCount > 0
+                    ? <Link to="/library" className={`${COUNT_CLASS} hover:text-primary`}>{count}</Link>
+                    : <span className={COUNT_CLASS}>{count}</span>}
                 <div className="mt-1 text-sm text-muted-foreground">{t('DASHBOARD.STEAM_GAMES')}</div>
             </div>
             <Link to="/library" className="inline-flex items-center gap-1 text-sm font-medium text-primary hover:underline">