fix(AsyncTmuxCmd): Handle text decoding manually for async subprocess

The AsyncTmuxCmd class was updated to handle text decoding manually since asyncio.create_subprocess_exec() doesn't support the text=True parameter that subprocess.Popen() supports.

Changes:
- Remove text=True and errors=backslashreplace from create_subprocess_exec()
- Handle bytes output by manually decoding with decode(errors="backslashreplace")
- Keep string processing logic consistent with tmux_cmd class

This fixes the ValueError("text must be False") error that occurred when trying to use text mode with asyncio subprocesses. The async version now properly handles text decoding while maintaining the same behavior as the synchronous tmux_cmd class.

Author: tony

src/libtmux/common.py

@@ -368,10 +368,8 @@ async def run(cls, *args: t.Any) -> AsyncTmuxCmd:
                 *cmd,
                 stdout=asyncio.subprocess.PIPE,
                 stderr=asyncio.subprocess.PIPE,
-                text=True,
-                errors="backslashreplace",
             )
-            stdout, stderr = await process.communicate()
+            stdout_bytes, stderr_bytes = await process.communicate()
             returncode: int = (
                 process.returncode if process.returncode is not None else -1
             )
@@ -383,6 +381,10 @@ async def run(cls, *args: t.Any) -> AsyncTmuxCmd:
                 msg,
             ) from e
 
+        # Decode bytes to string with error handling
+        stdout = stdout_bytes.decode(errors="backslashreplace")
+        stderr = stderr_bytes.decode(errors="backslashreplace")
+
         # Split on newlines and filter empty lines
         stdout_split: list[str] = stdout.split("\n")
         # remove trailing newlines from stdout