refactor: remove checkRateLimit and incrementApiCall completely

src/app.ts

@@ -8,6 +8,7 @@ import { getForestElements, getProgress, openDB, saveProgress } from "./storage/
 import type { ScreenName } from "./types";
 import { initParentScreen, showParentCodePrompt } from "./ui/parent";
 import { initLessonScreen, initWelcomeScreen } from "./ui/screens";
+import { levels } from "./game/levels";
 
 let db: IDBDatabase;
 let lessonCleanup: (() => void) | null = null;
@@ -26,8 +27,6 @@ export function getDB(): IDBDatabase {
 	return db;
 }
 
-const MAX_LEVEL = 6;
-
 /**
  * Ensure progress object has all fields (migration for older saved data).
  */
@@ -39,6 +38,16 @@ function migrateProgress(
 	if (progress.totalCorrect === undefined) progress.totalCorrect = 0;
 	if (progress.totalErrors === undefined) progress.totalErrors = 0;
 	if (progress.currentForestPage === undefined) progress.currentForestPage = 0;
+
+	// Migration: advance currentLevel if it was previously capped at a completed level.
+	// This fixes saved data from before levels 7-16 existed, where MAX_LEVEL was 6.
+	const maxLevel = levels[levels.length - 1]?.level ?? 16;
+	if (
+		progress.completedLevels.includes(progress.currentLevel) &&
+		progress.currentLevel < maxLevel
+	) {
+		progress.currentLevel = progress.currentLevel + 1;
+	}
 }
 
 async function handleLessonComplete(
@@ -74,10 +83,11 @@ async function handleLessonComplete(
 	}
 
 	// Advance to next level if this was the current level (LEVL-02, LEVL-03)
-	// Cap at MAX_LEVEL so we don't go beyond defined levels
+	// Cap at the total number of defined levels so we don't go beyond
+	const maxLevel = levels[levels.length - 1]?.level ?? 16;
 	if (
 		completedLevel === progress.currentLevel &&
-		completedLevel < MAX_LEVEL
+		completedLevel < maxLevel
 	) {
 		progress.currentLevel = completedLevel + 1;
 	}
@@ -114,9 +124,7 @@ async function handleLessonComplete(
 		progress.selectedCharacter,
 		() => {
 			// "Weiter üben" -- start next lesson
-			startLessonFromForest(
-				Math.min(progress.currentLevel, MAX_LEVEL),
-			);
+			startLessonFromForest(progress.currentLevel);
 		},
 		async () => {
 			// "Zurück zum Wald" -- navigate to page containing the new element
@@ -214,6 +222,8 @@ export async function initApp(): Promise<void> {
 	const progress = await getProgress(db);
 	if (progress && progress.selectedCharacter) {
 		migrateProgress(progress);
+		// Persist any migrations (e.g. currentLevel advancement) before rendering
+		await saveProgress(db, progress);
 
 		// Returning user -- init forest and go there
 		await initForestScreen(db, startLessonFromForest);
@@ -235,7 +245,7 @@ export async function initApp(): Promise<void> {
 			greetingEl.style.display = "flex";
 
 			// Fetch greeting async (shows immediately with avatar, text fills in)
-			getGreeting(progress.selectedCharacter, db).then((text) => {
+			getGreeting(progress.selectedCharacter).then((text) => {
 				textEl.innerHTML = renderInlineMarkdown(text);
 				speakText(text);
 			});