feat(04-04): wire audio and speech into lesson, reward, forest, and app

- playCorrectSound() on correct keypress in letter and word exercises
- playRewardSound() when reward image appears
- speakText() for companion comment on reward screen
- playForestElementSound() when new forest element renders
- speakText() for companion greeting on forest screen

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

src/forest/reward.ts

@@ -20,6 +20,8 @@ import {
 import { getForestComment } from "../companion/companion";
 import { getRandomFallbackForestComment } from "../companion/fallbacks";
 import type { CompanionType, ForestElement } from "../types";
+import { playRewardSound } from "../audio/sounds";
+import { speakText } from "../audio/speech";
 
 // --- Element types for random selection ---
 
@@ -192,16 +194,18 @@ export async function initRewardScreen(
 	};
 	const elementId = await saveForestElement(db, element);
 
-	// 6. Replace placeholder with actual image
+	// 6. Replace placeholder with actual image + play reward sound
 	const objectUrl = URL.createObjectURL(result.blob);
 	imageArea.innerHTML = "";
 	const img = document.createElement("img");
 	img.src = objectUrl;
 	img.alt = result.description;
 	imageArea.appendChild(img);
+	playRewardSound();
 
-	// 7. Show companion comment
+	// 7. Show companion comment + speak it aloud
 	companionTextEl.textContent = comment;
+	speakText(comment);
 
 	// 8. Wire buttons
 	continueBtn.onclick = () => {

src/forest/scene.ts

@@ -1,6 +1,7 @@
 import type { Progress, LevelStatus } from "../types";
 import { levels } from "../game/levels";
 import { getProgress, getForestElements } from "../storage/db";
+import { playForestElementSound } from "../audio/sounds";
 
 let activeObjectUrls: string[] = [];
 
@@ -44,6 +45,7 @@ export async function renderForestScene(
 		// Animate newly added element
 		if (element.id === newElementId) {
 			slot.classList.add("forest__element--new");
+			playForestElementSound();
 		}
 
 		slot.appendChild(img);