feat(points): show points result on every status save

Core now settles on GET /api/rewards/games/{appid}. The Frontend
shows a toast, refreshes the header balance, and lists the paid
rows and reasons on the game page. Deploy Core first.

README.md

@@ -52,7 +52,20 @@ To Be Played is split into three repositories:
   until a goal is reached (games finished, 100 % games, weeks in a row, months with a smaller pile, months with more
   play time). Skins (`skins.css`, Pastel, Retro CRT, Cyberpunk bought, Steam unlocked) are full themes made of CSS
   variables; a skin wins over accent and corners, while badges, borders, frames and effects stay on top. The balance is in the header. Every effect stands still (canvas: one static frame, no loop) with the
-  system setting "reduce motion" or the "Reduce animations" switch in the settings.
+  system setting "reduce motion" or the "Reduce animations" switch in the settings. After every status save (game page,
+  Play Next "Start", Questions, add game) `usePointsCheck` asks Core `GET /api/rewards/games/{appid}`, reloads the wallet
+  when the balance moved and shows a toast ("+N points", "Already paid on ...", "No points yet: reason"). The game page
+  shows the paid rows and the reason per missing kind (`GamePointsLine`); `pointsNotice` in `utils/rewards.js` picks the
+  toast, the reason codes come from Core and `POINTS.REASONS` only maps them to texts.
+
+```mermaid
+flowchart LR
+    Save["Status save"] --> Check["usePointsCheck"]
+    Check -->|"GET /api/rewards/games/{appid}"| Core["Core: settle + paid rows + reasons"]
+    Check --> Toast["Toast"]
+    Check -->|balance moved| Wallet["reloadWallet: header"]
+    Core --> Line["GamePointsLine on the game page"]
+```
 - **Landing page**: next to the community numbers and the top games, three blocks: games per platform, top genres and
   finished games per year of all users.
 - **Library**: status filters, source filter (Steam, PlayStation, manual; a linked set matches on each of its sources), "short games" filter (up to 10 h), search, sorting by playtime, recently seen, newest