fix: improve wtype error reporting with stderr output (#98)

* fix: improve wtype error reporting with stderr output

When wtype fails on Wayland systems, the error message didn't include
the stderr output from the command, making debugging difficult. This
change captures and logs stderr to help users understand why text
injection is failing.

Related to #97

* style: apply black formatting

src/vocalinux/text_injection/text_injector.py

@@ -207,8 +207,13 @@ class TextInjector:
                 try:
                     self._inject_with_wayland_tool(escaped_text)
                 except subprocess.CalledProcessError as e:
-                    logger.warning(f"Wayland tool failed: {e}. Falling back to xdotool")
-                    if "compositor does not support" in str(e).lower() and shutil.which("xdotool"):
+                    stderr_msg = e.stderr.strip() if e.stderr else "No stderr output"
+                    logger.warning(
+                        f"Wayland tool failed: {e}. stderr: {stderr_msg}. Falling back to xdotool"
+                    )
+                    if "compositor does not support" in str(
+                        e
+                    ).lower() + " " + stderr_msg.lower() and shutil.which("xdotool"):
                         logger.info("Automatically switching to XWayland fallback permanently")
                         self.environment = DesktopEnvironment.WAYLAND_XDOTOOL
                         self._inject_with_xdotool(escaped_text)
@@ -375,13 +380,23 @@ class TextInjector:
 
         Args:
             text: The text to inject (already escaped)
+
+        Raises:
+            subprocess.CalledProcessError: If the tool fails, with stderr captured
         """
         if self.wayland_tool == "wtype":
             cmd = ["wtype", text]
         else:  # ydotool
             cmd = ["ydotool", "type", text]
 
-        result = subprocess.run(cmd, check=True, stderr=subprocess.PIPE, text=True)
+        try:
+            result = subprocess.run(cmd, check=True, stderr=subprocess.PIPE, text=True)
+        except subprocess.CalledProcessError as e:
+            # Re-raise with stderr preserved for better diagnostics
+            raise subprocess.CalledProcessError(
+                e.returncode, e.cmd, output=e.output, stderr=e.stderr
+            ) from e
+
         logger.info(
             f"Text injected using {self.wayland_tool}: '{text[:20]}...' ({len(text)} chars)"
         )