Save on end-of-day, or after endgame.

Putting it here avoids a circular reference problem

src/hotbar.ts

@@ -6,6 +6,7 @@ import { addButton } from "./button.ts";
 import { getPlayerProgress } from "./playerprogress.ts";
 import { getStateManager } from "./statemanager.ts";
 import { getCheckModal } from "./checkmodal.ts";
+import { saveGame } from "./save.ts";
 
 type Button = {
   label: string;
@@ -112,6 +113,7 @@ export class Hotbar {
       },
       () => {
         getStateManager().advance();
+        saveGame();
       },
     );
   }

src/save.ts

@@ -85,7 +85,7 @@ function readBestSave(): SaveFileV1LoadResult {
   };
 }
 
-export function save() {
+export function saveGame() {
   const targetSlot: SaveSlot =
     readBestSave().slot === "FLEDGLING_SLOT_1"
       ? "FLEDGLING_SLOT_2"