Canvas: gruppe-drag, grid-persistering, ZOOM_MIN 5%

- Lasso-seleksjon → dra flytter alle valgte paneler sammen
- Grid on/off lagres i workspace-metadata (huskes mellom besøk)
- Zoom lagres allerede via kameraposisjon (x, y, zoom)
- ZOOM_MIN senket til 5% for spredte layouts

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

frontend/src/lib/components/canvas/Canvas.svelte

@@ -36,6 +36,8 @@
 		onCameraChange?: (camera: Camera) => void;
 		/** Callback when selection changes */
 		onSelectionChange?: (ids: string[]) => void;
+		/** Callback when grid is toggled */
+		onGridChange?: (enabled: boolean) => void;
 	}
 
 	let {
@@ -45,6 +47,7 @@
 		initialCamera = { x: 0, y: 0, zoom: 1.0 },
 		onObjectMove,
 		onCameraChange,
+		onGridChange,
 		onSelectionChange,
 	}: Props = $props();
 
@@ -62,6 +65,7 @@
 	let dragTargetId: string | null = null;
 	let dragStartWorld = { x: 0, y: 0 };
 	let dragObjectStart = { x: 0, y: 0 };
+	let dragGroupStarts = new Map<string, { x: number; y: number }>();
 	let panStart = { x: 0, y: 0 };
 	let cameraStart = { x: 0, y: 0 };
 	let lassoStart = { x: 0, y: 0 };
@@ -124,6 +128,7 @@
 			// 'g' toggles grid snap
 			if (e.code === 'KeyG' && !e.ctrlKey && !e.metaKey) {
 				grid = { ...grid, enabled: !grid.enabled };
+				onGridChange?.(grid.enabled);
 			}
 		}
 		function onKeyUp(e: KeyboardEvent) {
@@ -207,6 +212,13 @@
 				}
 				onSelectionChange?.([...selectedIds]);
 
+				// Record start positions for all selected objects (group drag)
+				dragGroupStarts = new Map();
+				for (const sid of selectedIds) {
+					const sobj = objects.find(o => o.id === sid);
+					if (sobj) dragGroupStarts.set(sid, { x: sobj.x, y: sobj.y });
+				}
+
 				containerEl.setPointerCapture(e.pointerId);
 				e.preventDefault();
 				return;
@@ -251,15 +263,19 @@
 			const sx = e.clientX - rect.left;
 			const sy = e.clientY - rect.top;
 			const world = screenToWorld(sx, sy, camera);
-			let newX = dragObjectStart.x + (world.x - dragStartWorld.x);
-			let newY = dragObjectStart.y + (world.y - dragStartWorld.y);
+			const dx = world.x - dragStartWorld.x;
+			const dy = world.y - dragStartWorld.y;
 
+			// Move all selected objects together
+			for (const [sid, start] of dragGroupStarts) {
+				let newX = start.x + dx;
+				let newY = start.y + dy;
 				if (grid.enabled) {
 					newX = snap(newX, grid.size);
 					newY = snap(newY, grid.size);
 				}
-
-			onObjectMove?.(dragTargetId, newX, newY);
+				onObjectMove?.(sid, newX, newY);
+			}
 
 			// Edge-pan: scroll canvas when dragging near edges
 			const edgeMargin = 40;
@@ -455,7 +471,7 @@
 		<button
 			class="canvas-toolbar-btn"
 			class:canvas-toolbar-active={grid.enabled}
-			onclick={() => (grid = { ...grid, enabled: !grid.enabled })}
+			onclick={() => { grid = { ...grid, enabled: !grid.enabled }; onGridChange?.(grid.enabled); }}
 			title="Snap-to-grid (G)"
 			aria-label="Snap-to-grid"
 		>#</button>

frontend/src/routes/+page.svelte

@@ -77,10 +77,14 @@
 				if (res.metadata) {
 					loadThemeFromMetadata(res.metadata as Record<string, unknown>);
 					// Load saved camera position
-					const cam = (res.metadata as Record<string, unknown>).camera as Camera | undefined;
+					const meta = res.metadata as Record<string, unknown>;
+					const cam = meta.camera as Camera | undefined;
 					if (cam && typeof cam.x === 'number') {
 						savedCamera = cam;
 					}
+					if (typeof meta.gridEnabled === 'boolean') {
+						gridEnabled = meta.gridEnabled;
+					}
 				}
 			})
 			.catch((err) => {
@@ -103,6 +107,7 @@
 	let layout = $state<WorkspaceLayout>({ panels: [] });
 	let layoutInitialized = $state(false);
 	let savedCamera = $state<Camera>({ x: 0, y: 0, zoom: 1.0 });
+	let gridEnabled = $state(false);
 
 	// When workspace node appears in store (after creation), load its layout
 	$effect(() => {
@@ -148,6 +153,7 @@
 						...currentMeta,
 						workspace_layout: layout,
 						camera: savedCamera,
+						gridEnabled,
 						preferences: {
 							...(currentMeta.preferences ?? {}),
 							theme: { hueBg: themeHueBg, hueSurface: themeHueSurface, hueAccent: themeHueAccent },
@@ -784,9 +790,10 @@
 			<Canvas
 				objects={canvasObjects}
 				onObjectMove={handleObjectMove}
-				grid={{ enabled: false, size: 20 }}
+				grid={{ enabled: gridEnabled, size: 20 }}
 				initialCamera={savedCamera}
 				onCameraChange={(cam) => { savedCamera = cam; persistMetadata(); }}
+				onGridChange={(enabled) => { gridEnabled = enabled; persistMetadata(); }}
 			>
 				{#snippet renderObject(obj)}
 					{@const trait = obj.id}