fix type assertions and add mantine type extension

src/types/mantine.d.ts

@@ -1,8 +1,13 @@
-import { PillVariant } from '@mantine/core';
+import { ActionIconSize, PillVariant } from '@mantine/core';
 
+type ExtendedActionIconSize = 'compact-md' | 'compact-sm' | 'compact-xs' | ActionIconSize;
 type ExtendedPillVariant = 'outline' | PillVariant;
 
 declare module '@mantine/core' {
+    export interface ActionIconProps {
+        size?: ExtendedActionIconSize;
+    }
+
     export interface PillProps {
         variant?: ExtendedPillVariant;
     }