feat: New theme + wire price adjustement

public/js/services/storage.js

@@ -1,17 +1,18 @@
 // Persistence in browser cookies.
 //
 // A cookie holds ~4 KB, so a save is base64url-encoded and split in chunks:
-//   ic_save_<theme>_n   -> number of chunks
-//   ic_save_<theme>_0.. -> the chunks
-// Each theme has its own save slot. Preferences (theme, language) are stored
-// in a single small cookie.
+//   ic_game_n   -> number of chunks
+//   ic_game_0.. -> the chunks
+// There is ONE game, shared by every theme (a theme is only a skin).
+// Preferences (theme, language) are stored in a single small cookie.
 
 import { readCookie, removeCookie, writeCookie } from './cookies.js';
 
 const CHUNK_SIZE = 3000;
 const MAX_CHUNKS = 6;
 const PREFS_KEY = 'ic_prefs';
-const saveKey = (themeId) => `ic_save_${themeId}`;
+const GAME_KEY = 'ic_game';
+const legacyKey = (themeId) => `ic_save_${themeId}`; // v1: one save per theme
 
 // ------------------------------------------------------------------ encoding
 
@@ -79,16 +80,30 @@ export function cookiesAvailable() {
 }
 
 /** Throws if the save does not fit in cookies. */
-export function saveGameText(themeId, text) {
-  writeChunked(saveKey(themeId), text);
+export function saveGameText(text) {
+  writeChunked(GAME_KEY, text);
 }
 
-export function loadGameText(themeId) {
-  return readChunked(saveKey(themeId));
+export function loadGameText() {
+  return readChunked(GAME_KEY);
 }
 
-export function deleteGame(themeId) {
-  removeChunked(saveKey(themeId));
+export function deleteGame() {
+  removeChunked(GAME_KEY);
+}
+
+/**
+ * Saves from the first version (one per theme). Returns their texts and
+ * removes those cookies, so the caller can merge them into the shared game.
+ */
+export function takeLegacySaves(themeIds) {
+  const texts = [];
+  for (const id of themeIds) {
+    const text = readChunked(legacyKey(id));
+    if (text) texts.push(text);
+    removeChunked(legacyKey(id));
+  }
+  return texts;
 }
 
 export function savePrefs(prefs) {