fix: Ensure Message Send Requires Key 🔑 (#1281)

* fix: only allow message send when key is provided when required
- create useRequiresKey hook
- pass same disabled prop to Textarea, AttachFile, and SendButton
- EndpointItem: add localization, stopPropagation, and remove commented code
- separate some hooks to new Input dir
- completely remove textareaHeight recoil state as is not needed
- update imports for moved hooks
- pass disabled prop to useTextarea

* feat: add localization to textarea placeholders

client/src/hooks/Input/useUserKey.ts

@@ -0,0 +1,60 @@
+import { useMemo, useCallback } from 'react';
+import {
+  useUpdateUserKeysMutation,
+  useUserKeyQuery,
+  useGetEndpointsQuery,
+} from 'librechat-data-provider';
+
+const useUserKey = (endpoint: string) => {
+  const { data: endpointsConfig } = useGetEndpointsQuery();
+  const config = endpointsConfig?.[endpoint];
+
+  const { azure } = config ?? {};
+  let keyEndpoint = endpoint;
+
+  if (azure) {
+    keyEndpoint = 'azureOpenAI';
+  } else if (keyEndpoint === 'gptPlugins') {
+    keyEndpoint = 'openAI';
+  }
+
+  const updateKey = useUpdateUserKeysMutation();
+  const checkUserKey = useUserKeyQuery(keyEndpoint);
+  const getExpiry = useCallback(() => {
+    if (checkUserKey.data) {
+      return checkUserKey.data.expiresAt;
+    }
+  }, [checkUserKey.data]);
+
+  const checkExpiry = useCallback(() => {
+    const expiresAt = getExpiry();
+    if (!expiresAt) {
+      return false;
+    }
+
+    const expiresAtDate = new Date(expiresAt);
+    if (expiresAtDate < new Date()) {
+      return false;
+    }
+    return true;
+  }, [getExpiry]);
+
+  const saveUserKey = useCallback(
+    (value: string, expiresAt: number) => {
+      const dateStr = new Date(expiresAt).toISOString();
+      updateKey.mutate({
+        name: keyEndpoint,
+        value,
+        expiresAt: dateStr,
+      });
+    },
+    [updateKey, keyEndpoint],
+  );
+
+  return useMemo(
+    () => ({ getExpiry, checkExpiry, saveUserKey }),
+    [getExpiry, checkExpiry, saveUserKey],
+  );
+};
+
+export default useUserKey;