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/api/gemini.test.ts

@@ -230,9 +230,9 @@ describe("Rate limiting", () => {
 		expect(canCallImage).toBe(true);
 	});
 
-	it("checkRateLimit returns false when at limit", async () => {
-		await incrementApiCall(db, "text");
-		await incrementApiCall(db, "image");
+	it("checkRateLimit returns false when at limit (10 text, 5 image)", async () => {
+		for (let i = 0; i < 10; i++) await incrementApiCall(db, "text");
+		for (let i = 0; i < 5; i++) await incrementApiCall(db, "image");
 
 		const canCallText = await checkRateLimit(db, "text");
 		const canCallImage = await checkRateLimit(db, "image");
@@ -241,7 +241,7 @@ describe("Rate limiting", () => {
 	});
 
 	it("incrementApiCall increments correct counter", async () => {
-		await incrementApiCall(db, "text");
+		for (let i = 0; i < 10; i++) await incrementApiCall(db, "text");
 
 		const canCallText = await checkRateLimit(db, "text");
 		const canCallImage = await checkRateLimit(db, "image");
@@ -251,8 +251,8 @@ describe("Rate limiting", () => {
 
 	it("rate limit resets when lastApiCallDate differs from today", async () => {
 		// Increment to hit limit
-		await incrementApiCall(db, "text");
-		await incrementApiCall(db, "image");
+		for (let i = 0; i < 10; i++) await incrementApiCall(db, "text");
+		for (let i = 0; i < 5; i++) await incrementApiCall(db, "image");
 
 		// Manually set lastApiCallDate to yesterday
 		const { getSettings, saveSettings } = await import("../storage/db");

src/api/gemini.ts

@@ -5,6 +5,8 @@ import type { GeminiConfig } from "./config";
 const GEMINI_BASE_URL =
 	"https://generativelanguage.googleapis.com/v1beta/models";
 const RETRY_DELAYS = [1000, 2000, 4000];
+const TEXT_RATE_LIMIT = 10;
+const IMAGE_RATE_LIMIT = 5;
 
 function sleep(ms: number): Promise<void> {
 	return new Promise((resolve) => setTimeout(resolve, ms));
@@ -159,7 +161,9 @@ export async function checkRateLimit(
 		await saveSettings(db, settings);
 	}
 
-	return settings.apiCallsToday[type] < 1;
+	return type === "text"
+		? settings.apiCallsToday.text < TEXT_RATE_LIMIT
+		: settings.apiCallsToday.image < IMAGE_RATE_LIMIT;
 }
 
 export async function incrementApiCall(