feat(points): balance, history and shop page

Add /points page with wallet balance, shop grouped by slot and ledger
history with game names. The wallet loads once in PreferencesContext after
login, so the header shows a balance chip and the link. Premium accents
gold and teal override the free accent while equipped. German and English.

public/i18n/en.json

@@ -294,6 +294,7 @@
     "LIGHT_MODE": "Light mode",
     "PLAY_NEXT": "Play next",
     "STATS": "Stats",
+    "POINTS": "Pile Points",
     "ADMIN": "Admin",
     "VIEW_AS": {
       "MENU": "View as",
@@ -801,6 +802,53 @@
     "STORE_LIST_BROKEN": "The list from the store page could not be read.",
     "STORE_LIST_WAITS": "The list from the store page waits until the running import is done. Do not reload this page."
   },
+  "POINTS": {
+    "TITLE": "Pile Points",
+    "BALANCE": "Balance",
+    "SHOP": "Shop",
+    "HISTORY": "History",
+    "BUY": "Buy",
+    "EQUIP": "Equip",
+    "UNEQUIP": "Take off",
+    "EQUIPPED": "Worn",
+    "EMPTY_HISTORY": "No points yet. Play a game from your pile!",
+    "ERROR_NOT_ENOUGH": "Not enough points.",
+    "HOW_TO": "How to earn points",
+    "RULES": {
+      "STARTED": "5 points when you start a game from your pile and play it (Steam games, once per game).",
+      "FINISHED": "30, 50 or 80 points when you finish a game (by its time to beat), if you really played it. Once per game.",
+      "COMPLETED": "+40 points when you reach 100 % achievements in a completed game.",
+      "FINISHED_MANUAL": "15 points for a manual game you finish, at most 3 per week.",
+      "MONTH": "40 points when your pile is smaller at the end of a month than at its start and you finished a game that month.",
+      "STREAK": "20 points for every week with a finished game after a week with a finished game."
+    },
+    "SLOTS": {
+      "AVATAR_BORDER": "Avatar border",
+      "BADGE": "Badge",
+      "ACCENT": "Accent",
+      "BANNER_FRAME": "Banner frame"
+    },
+    "ITEMS": {
+      "BORDER_GOLD": "Golden avatar border",
+      "BORDER_NEON": "Neon avatar border",
+      "BADGE_PILE_SLAYER": "Pile Slayer badge",
+      "BADGE_COMPLETIONIST": "Completionist badge",
+      "ACCENT_GOLD": "Gold accent",
+      "ACCENT_TEAL": "Teal accent",
+      "FRAME_GOLD": "Golden banner frame",
+      "FRAME_NEON": "Neon banner frame"
+    },
+    "KINDS": {
+      "STARTED": "Started",
+      "FINISHED": "Finished",
+      "FINISHED_MANUAL": "Finished (manual game)",
+      "COMPLETED": "100 % bonus",
+      "MONTH": "Smaller pile in",
+      "STREAK": "Streak week",
+      "STARTER": "Starter points",
+      "BUY": "Bought"
+    }
+  },
   "UNSAVED_CHANGES": {
     "CONFIRM": "You have changes that are not saved. Leave this page and lose them?"
   }