task(CAD-5): mline tool (parallel double line with miter offsets + optional end caps) + block editor service (open copies / save back / discard) with block-edit tool

frontend/src/plugins/builtin/core-modify/index.ts

@@ -25,6 +25,9 @@ import {
   extendElement,
   filletElements,
 } from '../../../tools/modification/geometry';
+import { openBlockForEdit, saveBlockEdit, discardBlockEdit } from '../../../services/blockEditorService';
+import { BLOCK_EDIT_MARKER } from '../../../services/blockEditorService';
+export { BLOCK_EDIT_MARKER };
 import type { Pt } from '../../../tools/modification/geometry';
 
 const uid = (prefix: string): string =>
@@ -1861,6 +1864,57 @@ export const measureTool: ToolExtensionV2 = {
   },
 };
 
+// ─────────────────────────────────────────────────────────────
+// Task CAD-5: Block-Editor — Blockdefinition in-place bearbeiten.
+// Klick 1 auf Block-Instanz oeffnet (markierte Kopien erscheinen),
+// Kopien normal bearbeiten, Klick 2 speichert zurueck in die
+// Definition, cancel verwirft. (Service: blockEditorService)
+// ─────────────────────────────────────────────────────────────
+
+export const blockEditTool: ToolExtensionV2 = {
+  manifest: {
+    id: 'block-edit',
+    label: 'Block bearbeiten',
+    icon: '\u2699',
+    ribbonTab: 'canvas',
+    tags: ['pro'],
+    description: 'Block-Instanz anklicken um die Definition zu bearbeiten (CAD-5)',
+  },
+  optionsSchema: [],
+  handlers: {
+    down(e, ctx) {
+      const c = ctx as FullToolContext;
+      if (!c.doc || !c.selection) return;
+      // Offene Sitzung? → speichern
+      if ((c.doc.getAllElements() as CADElement[]).some(
+        (el) => (el.properties as Record<string, unknown>)[BLOCK_EDIT_MARKER],
+      )) {
+        const saved = saveBlockEdit(c.doc as never);
+        ctx.setStatus(saved ? `Block "${saved}" gespeichert` : 'Speichern fehlgeschlagen');
+        return;
+      }
+      const hit = c.selection.hitTest(e.world.x, e.world.y, 8);
+      if (!hit || hit.type !== 'block_instance') {
+        ctx.setStatus('Block bearbeiten: Block-Instanz anklicken');
+        return;
+      }
+      const blockId = (hit.properties as Record<string, unknown>).blockId as string | undefined;
+      if (!blockId) {
+        ctx.setStatus('Block bearbeiten: Instanz ohne Block-Referenz');
+        return;
+      }
+      const opened = openBlockForEdit(c.doc as never, blockId);
+      ctx.setStatus(opened ? `Block "${blockId}" geöffnet — Elemente bearbeiten, erneut klicken speichert` : 'Block konnte nicht geöffnet werden');
+    },
+    cancel(ctx) {
+      const c = ctx as FullToolContext;
+      if (c.doc) discardBlockEdit(c.doc as never);
+      ctx.setPreview?.(null);
+      ctx.setStatus('Block-Bearbeitung verworfen');
+    },
+  },
+};
+
 export const coreModifyPlugin: PluginV2 = {
   manifest: {
     id: 'core-modify',
@@ -1871,5 +1925,5 @@ export const coreModifyPlugin: PluginV2 = {
     category: 'tools',
     enabledByDefault: true,
   },
-  tools: [selectTool, hatchTool, moveTool, copyTool, rotateTool, scaleTool, mirrorTool, deleteTool, offsetTool, trimTool, extendTool, filletTool, arrayRectTool, arrayPolarTool, chamferTool, lengthenTool, joinTool, explodeTool, alignTool, polylineEditTool, stretchTool, breakTool, arrayPathTool, divideTool, measureTool],
+  tools: [selectTool, hatchTool, moveTool, copyTool, rotateTool, scaleTool, mirrorTool, deleteTool, offsetTool, trimTool, extendTool, filletTool, arrayRectTool, arrayPolarTool, chamferTool, lengthenTool, joinTool, explodeTool, alignTool, polylineEditTool, stretchTool, breakTool, arrayPathTool, divideTool, measureTool, blockEditTool],
 };