🎨 优化扩展模块，完成ai接入和对话功能

data/st-core-scripts/lib/dialog-polyfill.css

@@ -0,0 +1,37 @@
+.poly_dialog {
+  position: absolute;
+  left: 0; right: 0;
+  width: -moz-fit-content;
+  width: -webkit-fit-content;
+  width: fit-content;
+  height: -moz-fit-content;
+  height: -webkit-fit-content;
+  height: fit-content;
+  margin: auto;
+  border: solid;
+  padding: 1em;
+  background: white;
+  color: black;
+  display: block;
+}
+
+.poly_dialog:not([open]) {
+  display: none;
+}
+
+.poly_dialog + .backdrop {
+  position: fixed;
+  top: 0; right: 0; bottom: 0; left: 0;
+  background: rgba(0,0,0,0.1);
+}
+
+._poly_dialog_overlay {
+  position: fixed;
+  top: 0; right: 0; bottom: 0; left: 0;
+}
+
+.poly_dialog.fixed {
+  position: fixed;
+  top: 50%;
+  transform: translate(0, -50%);
+}