feat(transcribe): add TranscribeCoachEmptyState and TranscribeDragDemo components

New coach card replaces the icon+sentence empty state in the Transcribe
panel (edit mode). Three-step guide with 5-s SMIL drawing animation in
step 1 only. Animation freezes at the final frame when
prefers-reduced-motion is active. Footer links to Wikipedia Kurrent and
the Richtlinien page open in new tabs with visible '(öffnet in neuem Tab)'
annotations. 34 new i18n keys in de/en/es.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/lib/components/TranscribeCoachEmptyState.svelte

@@ -0,0 +1,76 @@
+<script lang="ts">
+import { m } from '$lib/paraglide/messages.js';
+import TranscribeDragDemo from './TranscribeDragDemo.svelte';
+</script>
+
+<div class="border-brand-sand rounded-sm border bg-white p-7 shadow-sm">
+	<h2 class="mb-3 font-serif text-[22px] font-bold text-ink">
+		{m.transcribe_coach_title()}
+	</h2>
+	<p class="mb-6 font-serif text-[15px] leading-relaxed text-ink-2">
+		{m.transcribe_coach_preamble()}
+	</p>
+
+	<ol class="m-0 flex list-none flex-col gap-[18px] p-0">
+		<!-- Step 1 -->
+		<li class="grid gap-3.5" style="grid-template-columns: 34px 1fr; align-items: start;">
+			<span
+				aria-hidden="true"
+				class="flex h-7 w-7 flex-shrink-0 items-center justify-center rounded-full bg-ink font-sans text-sm font-bold text-white"
+				>1</span
+			>
+			<div class="pt-0.5 font-serif text-base leading-snug text-ink">
+				<strong>{m.transcribe_coach_step_1_title()}</strong>
+				{m.transcribe_coach_step_1_body()}
+				<TranscribeDragDemo />
+			</div>
+		</li>
+
+		<!-- Step 2 -->
+		<li class="grid gap-3.5" style="grid-template-columns: 34px 1fr; align-items: start;">
+			<span
+				aria-hidden="true"
+				class="flex h-7 w-7 flex-shrink-0 items-center justify-center rounded-full bg-ink font-sans text-sm font-bold text-white"
+				>2</span
+			>
+			<div class="pt-0.5 font-serif text-base leading-snug text-ink">
+				<strong>{m.transcribe_coach_step_2_title()}</strong>
+				{m.transcribe_coach_step_2_body()}
+			</div>
+		</li>
+
+		<!-- Step 3 -->
+		<li class="grid gap-3.5" style="grid-template-columns: 34px 1fr; align-items: start;">
+			<span
+				aria-hidden="true"
+				class="flex h-7 w-7 flex-shrink-0 items-center justify-center rounded-full bg-ink font-sans text-sm font-bold text-white"
+				>3</span
+			>
+			<div class="pt-0.5 font-serif text-base leading-snug text-ink">
+				<strong>{m.transcribe_coach_step_3_title()}</strong>
+			</div>
+		</li>
+	</ol>
+
+	<div class="border-brand-sand mt-6 flex flex-wrap gap-4 border-t pt-3.5 font-sans text-[13px]">
+		<a
+			href="https://de.wikipedia.org/wiki/Kurrent"
+			target="_blank"
+			rel="noopener noreferrer"
+			referrerpolicy="no-referrer"
+			class="text-ink underline decoration-brand-mint decoration-[1.5px] underline-offset-[3px]"
+		>
+			{m.transcribe_coach_footer_kurrent()}
+			<span class="ml-1 text-[11px] text-ink-3">{m.common_opens_new_tab()}</span>
+		</a>
+		<a
+			href="/hilfe/transkription"
+			target="_blank"
+			rel="noopener noreferrer"
+			class="text-ink underline decoration-brand-mint decoration-[1.5px] underline-offset-[3px]"
+		>
+			{m.transcribe_coach_footer_richtlinien()}
+			<span class="ml-1 text-[11px] text-ink-3">{m.common_opens_new_tab()}</span>
+		</a>
+	</div>
+</div>