Add Code Actions to the Toolbar (#31236)

Closes issue #31120.


https://github.com/user-attachments/assets/a4b3c86d-7358-49ac-b8d9-e9af50daf671

Release Notes:

- Added a code actions icon to the toolbar. This icon can be disabled by
setting `toolbar.code_actions` to `false`.

crates/icons/src/icons.rs

@@ -41,6 +41,7 @@ pub enum IconName {
     Binary,
     Blocks,
     Bolt,
+    BoltFilled,
     Book,
     BookCopy,
     BookPlus,