tmux_cmd(fix[logging]): standardize tmux_cmd extra on shlex.join

why: Pre-execution used shlex.join while error and post-execution used
subprocess.list2cmdline, producing inconsistent formats for the same
tmux_cmd extra key. list2cmdline uses Windows CMD quoting rules which
are incorrect on Linux.
what:
- Replace subprocess.list2cmdline(cmd) with shlex.join(cmd) in error handler
- Replace subprocess.list2cmdline(cmd) with shlex.join(cmd) in post-execution log
- All three logging sites now use shlex.join consistently

Author: tony

src/libtmux/common.py

@@ -284,7 +284,7 @@ def __init__(self, *args: t.Any, tmux_bin: str | None = None) -> None:
             logger.error(  # noqa: TRY400
                 "tmux subprocess failed",
                 extra={
-                    "tmux_cmd": subprocess.list2cmdline(cmd),
+                    "tmux_cmd": shlex.join(cmd),
                 },
             )
             raise
@@ -308,7 +308,7 @@ def __init__(self, *args: t.Any, tmux_bin: str | None = None) -> None:
             logger.debug(
                 "tmux command completed",
                 extra={
-                    "tmux_cmd": subprocess.list2cmdline(cmd),
+                    "tmux_cmd": shlex.join(cmd),
                     "tmux_exit_code": self.returncode,
                     "tmux_stdout": self.stdout[:100],
                     "tmux_stderr": self.stderr[:100],