add language learner project

Dutch and Korean (explained in English) and English (explained in Dutch)
from A1 to C1, with a Hangul level for Korean. Lessons with notes, words
and sentences generate multiple-choice, typing, sentence building, cloze,
listening and matching exercises. Endless challenges: a seeded daily
challenge, sprint, survival, mixed practice, level tests, spaced-repetition
reviews and generated drills (numbers, clock times, de/het, plurals, Dutch
and Korean conjugation, particles, Hangul reading, irregular verbs).
Progress is stored in localStorage with export/import.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/lib/language-learner/ui/Speak.svelte

@@ -0,0 +1,22 @@
+<script lang="ts">
+	import Volume2 from 'lucide-svelte/icons/volume-2';
+	import { speak } from '../speech';
+
+	let {
+		text,
+		voice,
+		size = 18,
+		label = 'Listen'
+	}: { text: string; voice: string; size?: number; label?: string } = $props();
+</script>
+
+<button
+	type="button"
+	class="ll-speak"
+	aria-label={label}
+	title={label}
+	onclick={(event) => {
+		event.stopPropagation();
+		speak(text, voice);
+	}}><Volume2 {size} aria-hidden="true" /></button
+>