debug: add console.log to InteractionEngine to trace drawing flow

frontend/src/interaction/index.ts

@@ -235,6 +235,7 @@ export class InteractionEngine {
 
     switch (this.state.activeTool) {
       case 'select':
+        console.log('[DEBUG] onMouseDown tool=select');
         this.handleSelectDown(e, raw);
         break;
       case 'line':
@@ -246,6 +247,7 @@ export class InteractionEngine {
       case 'text':
       case 'dimension':
       case 'leader':
+        console.log('[DEBUG] onMouseDown tool=' + this.state.activeTool + ' phase=' + this.state.phase);
         this.handleDrawDown(final);
         break;
       case 'revcloud':
@@ -466,6 +468,7 @@ export class InteractionEngine {
   }
 
   private handleDrawDown(pt: { x: number; y: number }): void {
+    console.log('[DEBUG] handleDrawDown called', { tool: this.state.activeTool, phase: this.state.phase, points: this.state.points.length, pt });
     this.state.phase = 'drawing';
     this.state.points.push(pt);
 
@@ -948,6 +951,7 @@ export class InteractionEngine {
   }
 
   private confirmDraw(): void {
+    console.log('[DEBUG] confirmDraw called', { tool: this.state.activeTool, hasPreview: !!this.state.previewElement, points: this.state.points.length });
     if (!this.state.previewElement) return;
     const layerId = this.layerManager.getActiveLayerId();
     const dimService = new DimensionService();