feat(03-01): extend Progress type, add LessonPhase, update rate limits

- Progress: added totalCorrect, totalErrors, errorKeyCounts, lastPlayedLevels
- New LessonPhase type: discover | practice | words
- Rate limits: 10 text / 5 image per day (was 1 each)
- Updated screens.ts with new Progress field defaults
- Updated existing tests for new rate limits and Progress shape

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/types.ts

@@ -14,8 +14,14 @@ export interface Progress {
 	sessionDates: string[]; // ISO date strings (days only)
 	selectedCharacter: CompanionType;
 	selectedLayout: KeyboardLayout;
+	totalCorrect: number;
+	totalErrors: number;
+	errorKeyCounts: Record<string, number>;
+	lastPlayedLevels: number[]; // last 3 played levels for review mechanic
 }
 
+export type LessonPhase = "discover" | "practice" | "words";
+
 // Companion assets store
 export interface CompanionAssets {
 	characterType: CompanionType;