feat(dashboard): new layout with sync button and top 5 most played

Remove the placeholder tiles and the settings tile, fix the mobile header width. iconUrl/formatPlaytime move to utils/games.js (599 min now shows 10h, not 10.0h), and the sync button logic to the useForceSync hook shared with the library.

public/i18n/de.json

@@ -70,7 +70,9 @@
     "LOADING": "Lade Dashboard ...",
     "HELLO": "Hallo",
     "STEAM_GAMES": "Steam Spiele",
-    "NO_STEAM_ID": "Keine Steam-ID hinterlegt – jetzt in den Einstellungen eintragen"
+    "NO_STEAM_ID": "Keine Steam-ID hinterlegt – jetzt in den Einstellungen eintragen",
+    "MOST_PLAYED": "Meistgespielt",
+    "SHOW_ALL": "Alle anzeigen"
   },
   "LIBRARY": {
     "TITLE": "Spielebibliothek",