fix: hide chat fork actions when chat import permission is disabled (#27711)

Co-authored-by: Nameless-Monster-Nerd <Nameless-Monster-Nerd@users.noreply.github.com>

src/lib/components/chat/MessageInput.svelte

@@ -1277,7 +1277,9 @@
 					canCompact: () => !!history?.currentId && contextCompactionEnabled,
 					compactDisabled: () => isActive,
 					canStatus: () => !!history?.currentId,
-					canFork: () => !!history?.currentId,
+					canFork: () =>
+						!!history?.currentId &&
+						($_user?.role === 'admin' || ($_user?.permissions?.chat?.import ?? true)),
 					forkDisabled: () => isActive,
 					contextUsage: () => statusContextUsage,
 					onCompact: compactHandler,