feat(message): add "Copy Text" context-menu action

The message menu had Copy Link (permalink) but no way to copy the message text
itself. Add a Copy Text item that copies the plain-text body with the reply
fallback stripped (trimReplyFromBody). It renders nothing when there is no
usable text body (e.g. media without a caption), so the caller can list it
unconditionally next to Copy Link. Uses Icons.Text.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

LOTUS_FEATURES.md

@@ -683,6 +683,10 @@ The indicator is hidden once the server confirms the event (when the internal st
 
 Context menu → **Forward** allows forwarding a message to any room the user is a member of.
 
+### Copy Message Text
+
+Context menu → **Copy Text** copies a message's plain-text body to the clipboard (reply fallback stripped via `trimReplyFromBody`), complementing the existing **Copy Link** (permalink) action. It renders only when the event has a usable text body, so media without a caption doesn't show an empty action.
+
 ### Draft Persistence
 
 - Composer drafts are stored in `localStorage` keyed by `roomId`

src/app/features/room/message/Message.tsx

@@ -56,6 +56,7 @@ import {
   getMemberAvatarMxc,
   getMemberName,
   sendStateEvent,
+  trimReplyFromBody,
 } from '../../../utils/room';
 import { mxcUrlToHttp } from '../../../utils/matrix';
 import { messageAriaLabel } from '../../../utils/a11y';
@@ -411,6 +412,43 @@ export const MessageCopyLinkItem = as<
   );
 });
 
+// Copies the message's plain-text body (reply fallback stripped) to the
+// clipboard. Renders nothing for events without a usable text body (e.g. media
+// without a caption), so the caller can list it unconditionally.
+export const MessageCopyTextItem = as<
+  'button',
+  {
+    mEvent: MatrixEvent;
+    onClose?: () => void;
+  }
+>(({ mEvent, onClose, ...props }, ref) => {
+  const content = mEvent.getContent();
+  const rawBody = typeof content.body === 'string' ? content.body : '';
+  const body = trimReplyFromBody(rawBody).trim();
+
+  if (!body) return null;
+
+  const handleCopy = () => {
+    copyToClipboard(body);
+    onClose?.();
+  };
+
+  return (
+    <MenuItem
+      size="300"
+      after={<Icon size="100" src={Icons.Text} />}
+      radii="300"
+      onClick={handleCopy}
+      {...props}
+      ref={ref}
+    >
+      <Text className={css.MessageMenuItemText} as="span" size="T300" truncate>
+        Copy Text
+      </Text>
+    </MenuItem>
+  );
+});
+
 export const MessagePinItem = as<
   'button',
   {
@@ -1284,6 +1322,7 @@ export const Message = React.memo(
                                 onClose={closeMenu}
                               />
                             )}
+                            <MessageCopyTextItem mEvent={mEvent} onClose={closeMenu} />
                             <MessageCopyLinkItem room={room} mEvent={mEvent} onClose={closeMenu} />
                             {canPinEvent && (
                               <MessagePinItem room={room} mEvent={mEvent} onClose={closeMenu} />
@@ -1513,6 +1552,7 @@ export const Event = React.memo(
                                 onClose={closeMenu}
                               />
                             )}
+                            <MessageCopyTextItem mEvent={mEvent} onClose={closeMenu} />
                             <MessageCopyLinkItem room={room} mEvent={mEvent} onClose={closeMenu} />
                           </Box>
                           {((!mEvent.isRedacted() && canDelete && !stateEvent) ||