🤖 Use justify-between for controls to fill available width

Controls now spread across full width with even spacing between them.
Replaces fixed gap-3 with dynamic justify-between spacing.

Author: ammar-agent

src/components/ChatInput.tsx

@@ -747,7 +747,7 @@ export const ChatInput: React.FC<ChatInputProps> = ({
             Editing message ({formatKeybind(KEYBINDS.CANCEL_EDIT)} to cancel)
           </div>
         )}
-        <div className="flex flex-wrap items-center gap-3">
+        <div className="flex flex-wrap items-center justify-between">
           {/* Model Selector - always visible */}
           <div
             className="flex items-center"