fix(controls): add type="button" to avoid form submissions (#1911) (#1912)

* fix(controls): add `type="button"` to avoid form submissions (#1911)

* chore(changeset): add

---------

Co-authored-by: Hossam Hassan <58523735+devhus@users.noreply.github.com>

.changeset/clever-rabbits-guess.md

@@ -0,0 +1,5 @@
+---
+"@vue-flow/controls": patch
+---
+
+Add `type="button"` to control buttons to avoid form submission if controls are nested in a form element.

packages/controls/src/ControlButton.vue

@@ -6,7 +6,7 @@ export default {
 </script>
 
 <template>
-  <button class="vue-flow__controls-button">
+  <button type="button" class="vue-flow__controls-button">
     <slot />
   </button>
 </template>