Implementer transfer service med innholdstransfer og lettvekts-triage (oppgave 20.4)

Transfer service bestemmer overføringsmodus basert på verktøy-par:
- innholdstransfer (ny node + source_material edge) for transformasjoner
  (f.eks. chat → editor: chatboble blir kilde for ny artikkel)
- lettvekts-triage (ny edge/plassering) for konteksttillegg
  (f.eks. chat → kanban: noden vises i begge kontekster)

Shift-modifier overstyrer alltid til innholdstransfer (ny node).

Endringer:
- transfer.ts: resolveTransferMode() med verktøy-par-matrise,
  executeTransfer() som kaller API for node/edge-opprettelse
- BlockShell: sender e.shiftKey til onDrop-callback
- Workspace handlePanelDrop: kobler sammen modus-resolving og API-kall
- Docs: oppdatert universell_overfoering.md med implementasjonsstatus

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

docs/features/universell_overfoering.md

@@ -226,7 +226,39 @@ Sync-workeren persisterer til PG `message_placements`-tabellen.
 
 Ny tabell `message_placement` med reducers for place/remove/move.
 
-## 9. Instruks for Claude Code
+## 9. Implementasjonsstatus
+
+### 9.1 Transfer service (`$lib/transfer.ts`)
+
+Sentral `transferService` med:
+- **`resolveTransferMode(source, target, shiftKey)`** — bestemmer modus fra verktøy-par.
+  Bruker en matrise (`DEFAULT_TRANSFER_MODE`) som mapper source→target til default-modus.
+  Shift-modifier overstyrer alltid til `innholdstransfer`.
+- **`executeTransfer(accessToken, payload, intent, shiftKey)`** — utfører overføringen:
+  - Innholdstransfer: `createNode()` → `createEdge(source_material)` → `createEdge(belongs_to)`
+  - Lettvekts-triage: `createEdge(belongs_to)` med placement-metadata
+- **Kompatibilitetssjekker** per verktøy-type (`checkChatCompat`, `checkKanbanCompat`, etc.)
+- **`createBlockReceiver(toolType)`** — factory for `BlockReceiver`-implementasjoner
+
+### 9.2 Shift-modifier
+
+- `BlockShell.handleDropEvent()` sender `e.shiftKey` til `onDrop`-callback
+- Workspace `handlePanelDrop()` sender shiftKey videre til `resolveTransferMode()`
+- Shift = alltid ny node (innholdstransfer), uansett verktøy-par
+
+### 9.3 Default-modus per verktøy-par
+
+| Source → Target | Default-modus | Begrunnelse |
+|----------------|---------------|-------------|
+| chat → kanban | lettvekts-triage | Noden vises på brettet |
+| chat → editor | innholdstransfer | Ny artikkelnode fra chatinnhold |
+| chat → calendar | lettvekts-triage | Noden planlegges |
+| kanban → calendar | lettvekts-triage | Oppgave planlegges |
+| * → editor | innholdstransfer | Artikkelverktøyet skaper nytt innhold |
+| * → ai_tool | innholdstransfer | AI skaper nytt innhold |
+| * → chat/kanban/calendar/studio | lettvekts-triage | Noden vises i ny kontekst |
+
+## 10. Instruks for Claude Code
 - **Innholdstransfer** (ny node) brukes når innholdet transformeres (chat → artikkel)
 - **Lettvekts-triage** (ny edge/plassering) brukes når kontekst legges til (chat → kanban)
 - `source_material`-edge kobler ny node tilbake til kilden ved innholdstransfer
@@ -236,3 +268,4 @@ Ny tabell `message_placement` med reducers for place/remove/move.
 - Drag-and-drop bruker HTML5 API mellom paneler, pointer events intra-canvas
 - Hold overføringslogikken i en sentral `transferService`
 - Mottaker-interfacet er obligatorisk for alle verktøy-panel-typer
+- Shift-modifier overstyrer alltid til innholdstransfer (ny node)

frontend/src/lib/components/blockshell/BlockShell.svelte

@@ -271,7 +271,8 @@
 						return;
 					}
 				}
-				onDrop?.(payload);
+				// Pass shiftKey so transfer service can override mode
+				onDrop?.(payload, e.shiftKey);
 			}
 		}
 

frontend/src/lib/components/blockshell/types.ts

@@ -76,6 +76,6 @@ export interface BlockShellEvents {
 	onFullscreenChange?: (isFullscreen: boolean) => void;
 	/** Panel minimize state changed (double-click header to toggle) */
 	onMinimizeChange?: (isMinimized: boolean) => void;
-	/** Drop received on this panel */
-	onDrop?: (payload: DragPayload) => void;
+	/** Drop received on this panel. shiftKey indicates Shift was held (forces innholdstransfer). */
+	onDrop?: (payload: DragPayload, shiftKey: boolean) => void;
 }

frontend/src/lib/transfer.ts

@@ -1,15 +1,27 @@
 /**
- * Transfer service — drag-and-drop compatibility between tool panels.
+ * Transfer service — drag-and-drop compatibility and execution between tool panels.
  *
- * Centralizes compatibility checking and incompatibility messages
- * for the universal transfer system (universell overføring).
+ * Centralizes compatibility checking, transfer mode resolution, and
+ * transfer execution for the universal transfer system (universell overføring).
  *
- * Ref: docs/features/universell_overfoering.md
+ * Two modes:
+ * - **Innholdstransfer**: Creates new node + source_material edge (content transformation)
+ * - **Lettvekts-triage**: Adds edge/placement to existing node (context addition)
+ *
+ * Default mode is determined by the source→target tool pair.
+ * Shift-modifier overrides to always create a new node (innholdstransfer).
+ *
+ * Ref: docs/features/universell_overfoering.md § 1, 3
  * Ref: docs/retninger/arbeidsflaten.md § Kompatibilitetsmatrise
  */
 
+import { createNode, createEdge, type CreateNodeResponse } from '$lib/api.js';
+import type { PlacementIntent } from '$lib/components/blockshell/types.js';
+
 export type ToolType = 'ai_tool' | 'editor' | 'chat' | 'kanban' | 'calendar' | 'studio';
 
+export type TransferMode = 'innholdstransfer' | 'lettvekts-triage';
+
 export interface DragPayload {
 	nodeId: string;
 	nodeKind: string;
@@ -256,3 +268,226 @@ export function createBlockReceiver(toolType: ToolType): { canReceive: (payload:
 		}
 	};
 }
+
+// =============================================================================
+// Transfer mode resolution
+// Ref: docs/features/universell_overfoering.md § 1.1
+// =============================================================================
+
+/**
+ * Default transfer mode matrix: source → target → mode.
+ *
+ * Innholdstransfer (new node): content is *transformed* for a new context.
+ *   e.g. chat → editor: chatboble becomes source material for an article.
+ *
+ * Lettvekts-triage (existing node): content *appears* in an additional context.
+ *   e.g. chat → kanban: same node gets a board placement.
+ *
+ * Rule of thumb: if the target tool creates a *new kind* of content from
+ * the source, it's innholdstransfer. If it just shows the same node in
+ * a different view, it's lettvekts-triage.
+ */
+const DEFAULT_TRANSFER_MODE: Partial<Record<ToolType, Partial<Record<ToolType, TransferMode>>>> = {
+	chat: {
+		kanban:   'lettvekts-triage',   // Same node appears on board
+		calendar: 'lettvekts-triage',   // Same node gets scheduled
+		editor:   'innholdstransfer',   // New article from chat content
+		studio:   'lettvekts-triage',   // Open audio in studio
+		ai_tool:  'innholdstransfer',   // AI creates new content from source
+		chat:     'lettvekts-triage',   // Cross-chat share
+	},
+	kanban: {
+		chat:     'lettvekts-triage',   // Share task in chat
+		calendar: 'lettvekts-triage',   // Schedule existing task
+		editor:   'innholdstransfer',   // Task becomes article source
+		studio:   'lettvekts-triage',   // Open in studio
+		ai_tool:  'innholdstransfer',   // AI processes task
+		kanban:   'lettvekts-triage',   // Cross-board move
+	},
+	editor: {
+		chat:     'lettvekts-triage',   // Share article in chat
+		kanban:   'lettvekts-triage',   // Track article as task
+		calendar: 'lettvekts-triage',   // Schedule article
+		studio:   'lettvekts-triage',   // Open media in studio
+		ai_tool:  'innholdstransfer',   // AI revises article
+		editor:   'innholdstransfer',   // Article → new article (fork)
+	},
+	calendar: {
+		chat:     'lettvekts-triage',   // Share event in chat
+		kanban:   'lettvekts-triage',   // Track event as task
+		editor:   'innholdstransfer',   // Event becomes article source
+		studio:   'lettvekts-triage',   // Open in studio
+		ai_tool:  'innholdstransfer',   // AI processes event
+		calendar: 'lettvekts-triage',   // Cross-calendar
+	},
+	studio: {
+		chat:     'lettvekts-triage',   // Share audio in chat
+		kanban:   'lettvekts-triage',   // Track audio as task
+		calendar: 'lettvekts-triage',   // Schedule audio
+		editor:   'innholdstransfer',   // Audio → article source
+		ai_tool:  'innholdstransfer',   // AI processes audio
+		studio:   'lettvekts-triage',   // Cross-studio
+	},
+	ai_tool: {
+		chat:     'lettvekts-triage',   // Share AI result in chat
+		kanban:   'lettvekts-triage',   // Track result as task
+		calendar: 'lettvekts-triage',   // Schedule result
+		editor:   'innholdstransfer',   // AI result → article source
+		studio:   'lettvekts-triage',   // Open in studio
+		ai_tool:  'innholdstransfer',   // Chain AI processing
+	},
+};
+
+/**
+ * Resolve the transfer mode for a source→target tool pair.
+ *
+ * - Default mode comes from the tool-pair matrix above.
+ * - Shift-modifier forces innholdstransfer (always create new node).
+ *
+ * @param source - Source tool type (where content was dragged from)
+ * @param target - Target tool type (where content was dropped)
+ * @param shiftKey - Whether Shift was held during drop (forces new node)
+ * @returns The resolved transfer mode
+ */
+export function resolveTransferMode(
+	source: ToolType,
+	target: ToolType,
+	shiftKey: boolean = false,
+): TransferMode {
+	// Shift override: always create a new node
+	if (shiftKey) return 'innholdstransfer';
+
+	// Look up default from matrix
+	const sourceMap = DEFAULT_TRANSFER_MODE[source];
+	if (sourceMap) {
+		const mode = sourceMap[target];
+		if (mode) return mode;
+	}
+
+	// Fallback: if the target creates new content (editor, ai_tool), use innholdstransfer.
+	// Otherwise default to lettvekts-triage (most common case).
+	if (target === 'editor' || target === 'ai_tool') return 'innholdstransfer';
+	return 'lettvekts-triage';
+}
+
+// =============================================================================
+// Transfer execution
+// Ref: docs/features/universell_overfoering.md § 1, 3, 4
+// =============================================================================
+
+/** Result of a completed transfer */
+export interface TransferResult {
+	mode: TransferMode;
+	/** The node that ended up in the target (original for triage, new for innholdstransfer) */
+	nodeId: string;
+	/** Edge ID for the source_material edge (only for innholdstransfer) */
+	sourceEdgeId?: string;
+	/** Edge ID for the placement/context edge (for lettvekts-triage) */
+	placementEdgeId?: string;
+}
+
+/**
+ * Execute a transfer: either create a new node with source_material edge
+ * (innholdstransfer) or add an edge/placement to the existing node
+ * (lettvekts-triage).
+ *
+ * @param accessToken - Auth token for API calls
+ * @param payload - The drag payload (source node info)
+ * @param intent - The placement intent from the receiver (target info)
+ * @param shiftKey - Whether Shift was held (overrides mode to innholdstransfer)
+ */
+export async function executeTransfer(
+	accessToken: string,
+	payload: DragPayload,
+	intent: PlacementIntent,
+	shiftKey: boolean = false,
+): Promise<TransferResult> {
+	const mode = resolveTransferMode(payload.sourcePanel, intent.contextType as ToolType, shiftKey);
+
+	if (mode === 'innholdstransfer') {
+		return executeInnholdstransfer(accessToken, payload, intent);
+	} else {
+		return executeLettvektsTriage(accessToken, payload, intent);
+	}
+}
+
+/**
+ * Innholdstransfer: Create a new node and link it back to the source
+ * with a source_material edge.
+ *
+ * Flow:
+ * 1. Create new content node (inherits title from source, empty content)
+ * 2. Create source_material edge: new node → source node
+ * 3. If target has a context, create belongs_to edge to context
+ */
+async function executeInnholdstransfer(
+	accessToken: string,
+	payload: DragPayload,
+	intent: PlacementIntent,
+): Promise<TransferResult> {
+	// 1. Create a new content node in the target context
+	const nodeResp: CreateNodeResponse = await createNode(accessToken, {
+		node_kind: 'content',
+		visibility: 'hidden',
+		metadata: {
+			transfer_source: payload.sourcePanel,
+			transfer_target: intent.contextType,
+		},
+	});
+
+	// 2. Create source_material edge: new node → original source
+	const edgeResp = await createEdge(accessToken, {
+		source_id: nodeResp.node_id,
+		target_id: payload.nodeId,
+		edge_type: 'source_material',
+		metadata: {
+			context: 'referenced',
+			excerpt: '',   // Will be populated by UI or AI later
+		},
+	});
+
+	// 3. Create belongs_to edge to target context if contextId is set
+	let placementEdgeId: string | undefined;
+	if (intent.contextId) {
+		const belongsResp = await createEdge(accessToken, {
+			source_id: nodeResp.node_id,
+			target_id: intent.contextId,
+			edge_type: 'belongs_to',
+			metadata: intent.position ? { placement: intent.position } : {},
+		});
+		placementEdgeId = belongsResp.edge_id;
+	}
+
+	return {
+		mode: 'innholdstransfer',
+		nodeId: nodeResp.node_id,
+		sourceEdgeId: edgeResp.edge_id,
+		placementEdgeId,
+	};
+}
+
+/**
+ * Lettvekts-triage: Add the existing node to a new context via edge.
+ *
+ * Flow:
+ * 1. Create belongs_to edge from source node to target context
+ *    (with position metadata for kanban column, calendar date, etc.)
+ */
+async function executeLettvektsTriage(
+	accessToken: string,
+	payload: DragPayload,
+	intent: PlacementIntent,
+): Promise<TransferResult> {
+	const edgeResp = await createEdge(accessToken, {
+		source_id: payload.nodeId,
+		target_id: intent.contextId,
+		edge_type: 'belongs_to',
+		metadata: intent.position ? { placement: intent.position } : {},
+	});
+
+	return {
+		mode: 'lettvekts-triage',
+		nodeId: payload.nodeId,
+		placementEdgeId: edgeResp.edge_id,
+	};
+}

frontend/src/routes/workspace/+page.svelte

@@ -36,7 +36,7 @@
 	import MixerTrait from '$lib/components/traits/MixerTrait.svelte';
 	import GenericTrait from '$lib/components/traits/GenericTrait.svelte';
 	import AiToolPanel from '$lib/components/AiToolPanel.svelte';
-	import { createBlockReceiver, type DragPayload } from '$lib/transfer';
+	import { createBlockReceiver, executeTransfer, resolveTransferMode, type DragPayload } from '$lib/transfer';
 	import type { BlockReceiver } from '$lib/components/blockshell/types';
 
 	const session = $derived($page.data.session as Record<string, unknown> | undefined);
@@ -344,14 +344,36 @@
 		return receiverCache.get(trait);
 	}
 
-	function handlePanelDrop(trait: string, payload: DragPayload) {
-		// Drop handling will be fully implemented in task 20.4 (transfer service).
-		// For now, log the intent for debugging.
+	function handlePanelDrop(trait: string, payload: DragPayload, shiftKey: boolean = false) {
 		const receiver = getReceiverForTrait(trait);
-		if (receiver?.receive) {
-			const intent = receiver.receive(payload);
-			console.log(`[universell-overføring] ${payload.sourcePanel} → ${trait}:`, intent);
+		if (!receiver?.receive) {
+			console.warn(`[universell-overføring] Ingen mottaker for ${trait}`);
+			return;
 		}
+
+		const intent = receiver.receive(payload);
+		const mode = resolveTransferMode(
+			payload.sourcePanel,
+			trait as import('$lib/transfer').ToolType,
+			shiftKey,
+		);
+		// Override intent mode with centrally resolved mode
+		intent.mode = mode;
+
+		if (!accessToken) {
+			console.error('[universell-overføring] Mangler accessToken — kan ikke utføre overføring');
+			return;
+		}
+
+		console.log(`[universell-overføring] ${payload.sourcePanel} → ${trait} (${mode}${shiftKey ? ', shift' : ''}):`, intent);
+
+		executeTransfer(accessToken, payload, intent, shiftKey)
+			.then((result) => {
+				console.log(`[universell-overføring] Fullført:`, result);
+			})
+			.catch((err) => {
+				console.error(`[universell-overføring] Feil:`, err);
+			});
 	}
 </script>
 
@@ -552,7 +574,7 @@
 						onResize={(w, h) => handlePanelResize(trait, w, h)}
 						onClose={() => handlePanelClose(trait)}
 						onMinimizeChange={(m) => handlePanelMinimize(trait, m)}
-						onDrop={(payload) => handlePanelDrop(trait, payload)}
+						onDrop={(payload, shiftKey) => handlePanelDrop(trait, payload, shiftKey)}
 					>
 						{#if knownTraits.has(trait)}
 							{#if trait === 'editor'}

tasks.md

@@ -226,8 +226,7 @@ Ref: `docs/features/universell_overfoering.md`, `docs/retninger/arbeidsflaten.md
 - [x] 20.1 message_placements tabell: PG-migrasjon + SpacetimeDB-modul med `place_message`, `remove_placement`, `move_on_canvas` reducers. Synk STDB→PG. Ref: `docs/features/universell_overfoering.md` § 2.
 - [x] 20.2 source_material edge-type: legg til i edge-skjema + maskinrommet-validering. Støtt kontekst-metadata (quoted, summarized, referenced) og excerpt-felt. Ref: `docs/retninger/arbeidsflaten.md` § "source_material-edge".
 - [x] 20.3 BlockReceiver interface: implementer `canReceive()`, `receive()`, `renderDropZone()` i alle trait-komponenter (Chat, Kanban, Kalender, Editor, Studio). Kompatibilitetsmatrise bestemmer godkjente drops. Ref: `docs/features/universell_overfoering.md` § 4–5.
-- [~] 20.4 Transfer service: `innholdstransfer`-modus (ny node + source_material edge) og `lettvekts-triage` (eksisterende node + ny edge/placement). Bestem modus fra verktøy-par. Shift-modifier for override. Ref: `docs/features/universell_overfoering.md` § 1, 3.
-  > Påbegynt: 2026-03-18T08:14
+- [x] 20.4 Transfer service: `innholdstransfer`-modus (ny node + source_material edge) og `lettvekts-triage` (eksisterende node + ny edge/placement). Bestem modus fra verktøy-par. Shift-modifier for override. Ref: `docs/features/universell_overfoering.md` § 1, 3.
 - [ ] 20.5 Panelrework — Chat: gjør ChatTrait til fullverdig BlockShell-panel med BlockReceiver, fullskjerm-toggle, og responsivt design innenfor begrenset container.
 - [ ] 20.6 Panelrework — Kanban: gjør KanbanTrait til BlockShell-panel med drag-and-drop aksept fra andre paneler, fullskjerm, responsivt.
 - [ ] 20.7 Panelrework — Kalender: gjør CalendarTrait til BlockShell-panel med drop-aksept for scheduling, fullskjerm, responsivt.