fix(svelte): center edge label

packages/svelte/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@xyflow/svelte",
-  "version": "0.0.15",
+  "version": "0.0.16",
   "description": "Svelte Flow - A highly customizable Svelte library for building node-based editors, workflow systems, diagrams and more.",
   "keywords": [
     "svelte",

packages/svelte/src/styles/base.css

@@ -1,3 +1,7 @@
 /* this gets exported as style.css and can be used for the default theming */
 @import '../../../system/src/styles/init.css';
 @import '../../../system/src/styles/base.css';
+
+.svelte-flow__edge-label {
+  text-align: center;
+}

packages/svelte/src/styles/style.css

@@ -1,3 +1,7 @@
 /* this gets exported as style.css and can be used for the default theming */
 @import '../../../system/src/styles/init.css';
 @import '../../../system/src/styles/style.css';
+
+.svelte-flow__edge-label {
+  text-align: center;
+}