chore(ui): trim mention/plus dropdown width to 360px

420px felt too wide; 360px gives long resource names enough room without
dominating the input area.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: TheodoreSpeaks

apps/sim/app/workspace/[workspaceId]/home/components/user-input/components/plus-menu-dropdown.tsx

@@ -245,7 +245,7 @@ export const PlusMenuDropdown = React.memo(
             side='top'
             sideOffset={8}
             avoidCollisions={!isMention}
-            className='flex w-[420px] max-w-[calc(100vw-32px)] flex-col overflow-hidden'
+            className='flex w-[360px] max-w-[calc(100vw-32px)] flex-col overflow-hidden'
             onCloseAutoFocus={handleCloseAutoFocus}
             onOpenAutoFocus={handleOpenAutoFocus}
             onKeyDown={handleContentKeyDown}