Remove unused components and assets from the project

Deleted unused components (Attachments, CustomMarkdownRenderer, EnableSearchButton, FlyoutSubMenu) and associated styles (katex.css) to streamline the codebase. This cleanup helps reduce technical debt and improve project maintainability.

src/components/chat/messages/MessageEditorComponent.tsx

@@ -0,0 +1,72 @@
+import React, { KeyboardEvent, useState } from "react";
+import { Box, Flex, IconButton, Textarea } from "@chakra-ui/react";
+import { Check, X } from "lucide-react";
+import { observer } from "mobx-react-lite";
+import store, { type IMessage } from "../../../stores/ClientChatStore";
+
+interface MessageEditorProps {
+  message: IMessage;
+  onCancel: () => void;
+}
+
+const MessageEditor = observer(({ message, onCancel }: MessageEditorProps) => {
+  const [editedContent, setEditedContent] = useState(message.content);
+
+  const handleSave = () => {
+    const messageIndex = store.messages.indexOf(message);
+    if (messageIndex !== -1) {
+      store.editMessage(messageIndex, editedContent);
+    }
+    onCancel();
+  };
+
+  const handleKeyDown = (e: KeyboardEvent<HTMLTextAreaElement>) => {
+    if (e.key === "Enter" && (e.metaKey || e.ctrlKey)) {
+      e.preventDefault();
+      handleSave();
+    }
+
+    if (e.key === "Escape") {
+      e.preventDefault();
+      onCancel();
+    }
+  };
+
+  return (
+    <Box width="100%">
+      <Textarea
+        value={editedContent}
+        onChange={(e) => setEditedContent(e.target.value)}
+        onKeyDown={handleKeyDown}
+        minHeight="100px"
+        bg="transparent"
+        border="1px solid"
+        borderColor="whiteAlpha.300"
+        _hover={{ borderColor: "whiteAlpha.400" }}
+        _focus={{ borderColor: "brand.100", boxShadow: "none" }}
+        resize="vertical"
+        color="text.primary"
+      />
+      <Flex justify="flex-end" mt={2} gap={2}>
+        <IconButton
+          aria-label="Cancel edit"
+          icon={<X />}
+          onClick={onCancel}
+          size="sm"
+          variant="ghost"
+          color={"accent.danger"}
+        />
+        <IconButton
+          aria-label="Save edit"
+          icon={<Check />}
+          onClick={handleSave}
+          size="sm"
+          variant="ghost"
+          color={"accent.confirm"}
+        />
+      </Flex>
+    </Box>
+  );
+});
+
+export default MessageEditor;