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.

public/i18n/de.json

@@ -575,7 +575,6 @@
       "TREND_ADDED": "Diesen Monat zum Stapel hinzugekommen",
       "TREND_DONE": "Diesen Monat vom Stapel gegangen",
       "NEW_IN_LIBRARY": "Neu",
-      "OPEN": "Im Steam-Shop öffnen",
       "GAMES_one": "{{count}} Spiel",
       "GAMES_other": "{{count}} Spiele"
     }