fix(compiler-sfc): fix ref sugar rewrite for identifiers in ts casting expressions

fix #4254

packages/compiler-sfc/__tests__/__snapshots__/compileScriptRefSugar.spec.ts.snap

@@ -92,6 +92,23 @@ return { n, a, b, c }
 }"
 `;
 
+exports[`<script setup> ref sugar handle TS casting syntax 1`] = `
+"import { ref as _ref, defineComponent as _defineComponent } from 'vue'
+
+export default _defineComponent({
+  setup(__props, { expose }) {
+  expose()
+
+        let n = _ref<number | undefined>()
+        console.log(n.value!)
+        console.log(n.value as number)
+      
+return { n }
+}
+
+})"
+`;
+
 exports[`<script setup> ref sugar mixing $ref & $computed declarations 1`] = `
 "import { ref as _ref, computed as _computed } from 'vue'