fix: 修改描述区字体大小计算逻辑，确保在极小区域下仍能正常渲染文本

src/services/editor.service.ts

@@ -1471,7 +1471,7 @@ function drawArea(ctx: CanvasRenderingContext2D, pen: MapPen): void {
     let descFontSize = Math.min(w / 6, h / 4, 200);
     let lines: string[] = [];
 
-    while (descFontSize > 8) {
+    while (descFontSize > 1) {
       ctx.font = `${descFontSize}px ${fontFamily}`;
       const maxCharsPerLine = Math.floor(w / (descFontSize * 0.8));