Change report modal to include category selection in web UI (#17565)

* Change report modal to include category selection in web UI

* Various fixes and improvements

- Change thank you text to be different based on category
- Change starting headline to be different for account and status reports
- Change toggle components to have a checkmark when checked
- Fix report dialog being cut off on small screens
- Fix thank you screen offering mute or block if already muted or blocked
- Refactor toggle components in report dialog into one component

* Change wording on final screen

* Change checkboxes to be square when multiple options are possible

app/javascript/mastodon/components/check.js

@@ -0,0 +1,9 @@
+import React from 'react';
+
+const Check = () => (
+  <svg width='14' height='11' viewBox='0 0 14 11'>
+    <path d='M11.264 0L5.26 6.004 2.103 2.847 0 4.95l5.26 5.26 8.108-8.107L11.264 0' fill='currentColor' fillRule='evenodd' />
+  </svg>
+);
+
+export default Check;