fix: 修复hex颜色值为3位时转换错误的bug

src/shared/color.js

@@ -7,8 +7,12 @@ export function hexToRgba (hex) {
     r = hex.substring(0, 2)
     g = hex.substring(2, 4)
     b = hex.substring(4, 6)
-  } else {
-    return false
+  } else if (hex.length === 3) {
+    r = hex.substring(0, 1)
+    g = hex.substring(1, 2)
+    b = hex.substring(2, 3)
+  } else {
+    return false
   }
   if (r.length === 1) {
     r += r