feat(writing): token-usage in version history + draft drag-source

Two small UX wins.

Version-history shows generation cost
- VersionHistory takes a generations[] prop (DetailView already pulls
  one via useGenerationsForDraft) and looks up each AI version's linked
  Generation by id. When found, renders a monospace cost line under the
  version's wordcount: "1234 → 567 Tokens · 1.4s · ollama/gemma3:4b".
- Skips silently when the generation row isn't there (e.g. older drafts
  before the field was tracked, or a generation that was reverted).
- Lets the user see what each draft cost without digging into the
  Workbench audit timeline.

Drafts as drag source
- DraftCard wires `use:dragSource` with type='draft' + a payload
  carrying id / title / kind / content / wordCount / topic. Cards in
  the Writing list view are now drag origins for any drop target that
  declares acceptsDropFrom: ['draft'].
- App-registry entry for 'writing' gets the matching collection /
  paramKey / dragType / getDisplayData fields so the workbench layer
  treats drafts as full first-class drag-citizens (sibling navigation,
  display fallbacks).
- @mana/shared-ui DragType union extended with 'draft'.

No drop-target wiring yet — articles' acceptsDropFrom can pick up
'draft' as a follow-up, but the M10 ExportMenu's "Als Artikel
speichern" already covers that flow from the editor side.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/mana/apps/web/src/lib/app-registry/apps.ts

@@ -1354,6 +1354,16 @@ registerApp({
 				),
 		},
 	],
+	collection: 'writingDrafts',
+	paramKey: 'draftId',
+	dragType: 'draft',
+	getDisplayData: (item) => ({
+		title: (item.title as string) || (item.topic as string) || 'Draft',
+		subtitle:
+			typeof item.wordCount === 'number' && item.wordCount > 0
+				? `${item.wordCount} Wörter`
+				: undefined,
+	}),
 });
 
 registerApp({

apps/mana/apps/web/src/lib/modules/writing/components/DraftCard.svelte

@@ -1,5 +1,6 @@
 <script lang="ts">
 	import { formatDate } from '$lib/i18n/format';
+	import { dragSource } from '@mana/shared-ui/dnd';
 	import StatusBadge from './StatusBadge.svelte';
 	import { KIND_LABELS } from '../constants';
 	import type { Draft, DraftVersion } from '../types';
@@ -41,7 +42,22 @@
 	}
 </script>
 
-<button type="button" class="card" onclick={open}>
+<button
+	type="button"
+	class="card"
+	onclick={open}
+	use:dragSource={{
+		type: 'draft',
+		data: () => ({
+			id: draft.id,
+			title: draft.title || draft.briefing.topic || 'Unbenannt',
+			kind: draft.kind,
+			content: currentVersion?.content ?? '',
+			wordCount: currentVersion?.wordCount ?? 0,
+			topic: draft.briefing.topic,
+		}),
+	}}
+>
 	<header>
 		<span class="kind" title={kind.de}>
 			<span aria-hidden="true">{kind.emoji}</span>

apps/mana/apps/web/src/lib/modules/writing/components/VersionHistory.svelte

@@ -3,17 +3,26 @@
   "Wiederherstellen" flips the draft's `currentVersionId` back via the
   store. Versions are immutable snapshots so Restore is a pointer change,
   not a destructive revert.
+
+  AI-generated versions also show their generation cost (token usage +
+  duration) when the linked Generation row is available, so the user can
+  see what each draft cost without digging into Workbench audit views.
 -->
 <script lang="ts">
 	import { draftsStore } from '../stores/drafts.svelte';
-	import type { DraftVersion } from '../types';
+	import type { DraftVersion, Generation } from '../types';
+	import { formatDate as formatLocaleDate } from '$lib/i18n/format';
 
 	let {
 		versions,
+		generations = [],
 		currentVersionId,
 		draftId,
 	}: {
 		versions: DraftVersion[];
+		/** Generations for this draft. Used to show token-usage / duration
+		 *  next to AI-generated versions; harmless to omit. */
+		generations?: Generation[];
 		currentVersionId: string | null;
 		draftId: string;
 	} = $props();
@@ -21,6 +30,8 @@
 	// Newest on top.
 	const sorted = $derived([...versions].sort((a, b) => b.versionNumber - a.versionNumber));
 
+	const generationById = $derived(new Map(generations.map((g) => [g.id, g])));
+
 	async function restore(versionId: string) {
 		await draftsStore.restoreVersion(draftId, versionId);
 	}
@@ -28,18 +39,34 @@
 	function formatDate(iso: string): string {
 		const d = new Date(iso);
 		if (Number.isNaN(d.getTime())) return '';
-		return d.toLocaleString('de-DE', {
+		return formatLocaleDate(d, {
 			day: '2-digit',
 			month: '2-digit',
 			hour: '2-digit',
 			minute: '2-digit',
 		});
 	}
+
+	function genCostLine(version: DraftVersion): string | null {
+		if (!version.generationId) return null;
+		const gen = generationById.get(version.generationId);
+		if (!gen) return null;
+		const parts: string[] = [];
+		if (gen.tokenUsage) {
+			parts.push(`${gen.tokenUsage.input} → ${gen.tokenUsage.output} Tokens`);
+		}
+		if (gen.durationMs) {
+			parts.push(`${(gen.durationMs / 1000).toFixed(1)}s`);
+		}
+		if (gen.model) parts.push(gen.model);
+		return parts.length > 0 ? parts.join(' · ') : null;
+	}
 </script>
 
 <ul class="history">
 	{#each sorted as version (version.id)}
 		{@const isCurrent = version.id === currentVersionId}
+		{@const costLine = genCostLine(version)}
 		<li class="version" class:current={isCurrent}>
 			<div class="meta">
 				<strong>v{version.versionNumber}</strong>
@@ -54,6 +81,9 @@
 				<span>{version.wordCount} Wörter</span>
 				<span class="date">{formatDate(version.createdAt)}</span>
 			</div>
+			{#if costLine}
+				<div class="cost" title="Verbrauch + Modell der zugehörigen Generation">{costLine}</div>
+			{/if}
 			{#if version.summary}
 				<p class="summary">{version.summary}</p>
 			{/if}
@@ -114,6 +144,12 @@
 		font-size: 0.75rem;
 		color: var(--color-text-muted, rgba(0, 0, 0, 0.55));
 	}
+	.cost {
+		font-size: 0.7rem;
+		font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
+		color: var(--color-text-muted, rgba(0, 0, 0, 0.55));
+		opacity: 0.8;
+	}
 	.summary {
 		margin: 0;
 		font-size: 0.8rem;

apps/mana/apps/web/src/lib/modules/writing/views/DetailView.svelte

@@ -510,6 +510,7 @@
 				<h2>Versionen</h2>
 				<VersionHistory
 					versions={versions ?? []}
+					generations={generations ?? []}
 					currentVersionId={draft.currentVersionId}
 					draftId={draft.id}
 				/>

packages/shared-ui/src/dnd/types.ts

@@ -27,7 +27,8 @@ export type DragType =
 	| 'dream'
 	| 'journal-entry'
 	| 'first'
-	| 'wish';
+	| 'wish'
+	| 'draft';
 
 export interface DragPayload<T = Record<string, unknown>> {
 	type: DragType;