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/en.json

@@ -70,7 +70,9 @@
     "LOADING": "Loading dashboard ...",
     "HELLO": "Hello",
     "STEAM_GAMES": "Steam Games",
-    "NO_STEAM_ID": "No Steam ID saved yet – add it in the settings"
+    "NO_STEAM_ID": "No Steam ID saved yet – add it in the settings",
+    "MOST_PLAYED": "Most played",
+    "SHOW_ALL": "Show all"
   },
   "LIBRARY": {
     "TITLE": "Game Library",