feat(quick-260329-ton): replace textContent with innerHTML + renderInlineMarkdown at all AI-text insertion points

- src/app.ts: greeting text now renders inline markdown
- src/ui/screens.ts: letter intro text now renders inline markdown
- src/forest/reward.ts: forest comment now renders inline markdown
- All 3 sites use innerHTML with XSS-safe renderInlineMarkdown

src/forest/reward.ts

@@ -22,6 +22,7 @@ import { getRandomFallbackForestComment } from "../companion/fallbacks";
 import type { CompanionType, ForestElement } from "../types";
 import { playRewardSound } from "../audio/sounds";
 import { speakText } from "../audio/speech";
+import { renderInlineMarkdown } from "../utils/markdown";
 
 // --- Element types for random selection ---
 
@@ -204,7 +205,7 @@ export async function initRewardScreen(
 	playRewardSound();
 
 	// 7. Show companion comment + speak it aloud
-	companionTextEl.textContent = comment;
+	companionTextEl.innerHTML = renderInlineMarkdown(comment);
 	speakText(comment);
 
 	// 8. Wire buttons