feat: 添加按钮组件，优化表单提交功能

src/__fk-inputs__/inputs/form.ts

@@ -18,12 +18,7 @@ const formInput = createSection('form', () => ({
   },
 }));
 
-export const form: FormKitTypeDefinition = {
-  schema: formInput(
-    '$slots.default',
-    messages(),
-    actions(submitInput()),
-    createSection(
+const button = createSection(
   // https://formkit.com/playground?fkv=latest&fileTab=Playground.vue&files=jc%5B%28%27name%21%27Playground.vue%27%7Eeditor%21%27%3Cscripzsetup%3EBtestUgWasyncJEqawaiznew+Promise%7Br3%3E+setTimeout%7Br%2C+5000%7D%7D-%29-BsGW%5Bq%286%24formkit142*lX1LogU2%29-%5D%3B-B_W%28qY1Uput2sG8%5B6%286*%24cmp19xbUdZsHAttrsxprops8%286Nignore8true%2C6NY1sHx*OZOx*lXZsHLXx%29%2C6*V6N%22%24lXx*%286N*ifZOxN%24el1spanxNV%22+loadUg...%22%5D6N%29%2C6*%5D6%29q%5D%2C-%29-BC3JE%29--%2F%2F+Then+we+attach+a+library-C.library3JnodeEqifJnode.props.Y3%3D%3D+%224%22%7D+%286node.defUe%7B_%7Dq%29-%29--MscriptQ-%3Cj-+%3C96YRform76%3AplugUsR%5BC%5D76%3AactionsRfalse76%40sHRtestUg7q%3E6%3C9SG+%3AsGRsG7+%2F%3E6M9Q*M9QMj%27%7Eadded%21true%29%5D*++-%5Cn18%222%22%2CqW%3D4spUnUgSH6-N7%5C%278%3A+9FormKitB-conszCcustomInputsE%7D3%3E+%28GchemaHubmitJ+%7BM%3C%2FN**OdisabledQ%3E-R%3D7UinVchildren8%5BW3+XabelYtypeZ1%24_4DefUitionjtemplateQq-*x2Nzt+%01zxqj_ZYXWVURQONMJHGECB98764321-*_&imports=jc%28%27name%21%27ImportMap%27%7Eeditor%21%27%28*+1vue%5C%211https%3A%2F%2Fcdn.jsdelivr.net%2Fnpm%2Fvue%403%2Fdist%2Fvue.esm-browser.min.js0*%29*%27%29*%5Cn0%5C%271+0%0110*_&css-framework=genesis
   'button',
   () => ({
@@ -35,7 +30,14 @@ export const form: FormKitTypeDefinition = {
       loading: '$state.loading || undefined',
     },
   }),
-    )(),
+);
+
+export const form: FormKitTypeDefinition = {
+  schema: formInput(
+    '$slots.default',
+    messages(),
+    actions(submitInput()),
+    button(), //
   ),
   type: 'group',
   props: [