feat: improve media handling, file conversion, and error management

- Added UUID-based "x-xai-request-id" header and 403 error handling in Grok.py
- Updated backend_api.py to handle empty media results and unsupported file types with error raising and file cleanup
- Simplified render logic in website.py by removing is_live flag and related code
- Changed "audio/wav" MIME type to "audio/x-wav" in image/__init__.py
- Added is_valid_media and is_valid_audio functions to image/__init__.py for stricter media validation
- Enhanced MarkItDown integration in markitdown/__init__.py with convert_stream method supporting non-seekable streams
- Modified _transcribe_audio.py to use recognize_faster_whisper if available, fallback to recognize_google
- Updated providers/helper.py to prioritize "text" key in to_string function
- Improved stream_read_files in files.py to skip DOWNLOADS_FILE and adjust code block formatting
- Added get_filename_from_url utility in files.py for consistent filename generation from URLs
- Enhanced download_urls in files.py to use MarkItDown for URL conversion and improved error logging
- Improved render_part and related functions in media.py to use new media validation logic and handle more cases
- Adjusted merge_media and render_messages in media.py for stricter part filtering and validation

g4f/Provider/needs_auth/Grok.py

@@ -4,6 +4,7 @@ import os
 import json
 import time
 import asyncio
+import uuid
 from typing import Dict, Any, AsyncIterator
 
 try:
@@ -13,8 +14,9 @@ except ImportError:
 
 from ...typing import Messages, AsyncResult
 from ...providers.response import JsonConversation, Reasoning, ImagePreview, ImageResponse, TitleGeneration, AuthResult, RequestLogin
-from ...requests import StreamSession, get_nodriver, DEFAULT_HEADERS
+from ...requests import StreamSession, get_nodriver, DEFAULT_HEADERS, merge_cookies
 from ...requests.raise_for_status import raise_for_status
+from ...errors import MissingAuthError
 from ..base_provider import AsyncAuthedProvider, ProviderModelMixin
 from ..helper import format_prompt, get_last_user_message
 
@@ -112,7 +114,10 @@ class Grok(AsyncAuthedProvider, ProviderModelMixin):
                 url = f"{cls.conversation_url}/new"
             else:
                 url = f"{cls.conversation_url}/{conversation_id}/responses"
-            async with session.post(url, json=payload) as response:
+            async with session.post(url, json=payload, headers={"x-xai-request-id": str(uuid.uuid4())}) as response:
+                if response.status == 403:
+                    raise MissingAuthError("Invalid secrets")
+                auth_result.cookies = merge_cookies(auth_result.cookies, response)
                 await raise_for_status(response)
                 thinking_duration = None
                 async for line in response.iter_lines():