Merge commit '6936e5aa693ccc4aabd26ef18a65fbb8132f6f74' into glitch-soc/merge-upstream-composer

Conflicts:
- `app/javascript/mastodon/features/compose/components/compose_form.jsx`:
  Upstream completely redesigned this, and glitch-soc had different handling for
  the character limit.
  Ported upstream's change to the new version.
- `app/javascript/mastodon/features/compose/components/poll_form.jsx`:
  Upstream completely redesigned this, and glitch-soc had different limits for
  option length and number of options.
  Ported glitch-soc's changes to the new version.

Additional change:
- `app/javascript/styles/components.scss`:
  Change how the new image is looked up.

app/javascript/packs/share.jsx

@@ -13,10 +13,12 @@ function loaded() {
 
   if (mountNode) {
     const attr = mountNode.getAttribute('data-props');
-    if(!attr) return;
+
+    if (!attr) return;
 
     const props = JSON.parse(attr);
     const root = createRoot(mountNode);
+
     root.render(<ComposeContainer {...props} />);
   }
 }