💡 feat: Improve Reasoning Content UI, copy-to-clipboard, and error handling (#10278)

* ✨ feat: Refactor error handling and improve loading states in MessageContent component

* ✨ feat: Enhance Thinking and ContentParts components with improved hover functionality and clipboard support

* fix: Adjust padding in Thinking and ContentParts components for consistent layout

* ✨ feat: Add response label and improve message editing UI with contextual indicators

* ✨ feat: Add isEditing prop to Feedback and Fork components for improved editing state handling

* refactor: Remove isEditing prop from Feedback and Fork components for cleaner state management

* refactor: Migrate state management from Recoil to Jotai for font size and show thinking features

* refactor: Separate ToggleSwitch into RecoilToggle and JotaiToggle components for improved clarity and state management

* refactor: Remove unnecessary comments in ToggleSwitch and MessageContent components for cleaner code

* chore: reorder import statements in Thinking.tsx

* chore: reorder import statement in EditTextPart.tsx

* chore: reorder import statement

* chore: Reorganize imports in ToggleSwitch.tsx

---------

Co-authored-by: Danny Avila <danny@librechat.ai>

client/src/store/showThinking.ts

@@ -0,0 +1,8 @@
+import { createStorageAtom } from './jotai-utils';
+
+const DEFAULT_SHOW_THINKING = false;
+
+/**
+ * This atom controls whether AI reasoning/thinking content is expanded by default.
+ */
+export const showThinkingAtom = createStorageAtom<boolean>('showThinking', DEFAULT_SHOW_THINKING);