Implement the new invite modal designs

test/__snapshots__/Toast-test.tsx.snap

@@ -0,0 +1,22 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Toast renders 1`] = `
+<button
+  aria-describedby="radix-:r5:"
+  aria-labelledby="radix-:r4:"
+  class="overlay animate toast"
+  data-state="open"
+  id="radix-:r3:"
+  role="dialog"
+  style="pointer-events: auto;"
+  tabindex="-1"
+  type="button"
+>
+  <h3
+    class="_font-body-sm-semibold_1jx6b_45"
+    id="radix-:r4:"
+  >
+    Hello world!
+  </h3>
+</button>
+`;