Fixes GTK4 Layer Shell and Ollama integration issues

Addresses multiple issues related to GTK4 Layer Shell initialization and Ollama integration.

- Reorders initialization to ensure the layer shell is set up before window properties.
- Adds error detection for layer shell initialization failures.
- Implements a focus event handler to prevent focus-out warnings.
- Introduces a launcher script to activate the virtual environment, force native Wayland, and preload the GTK4 Layer Shell library.
- Warns users of incorrect GDK_BACKEND settings.
- Updates the Ollama client to handle responses from both older and newer versions of the Ollama SDK.

These changes improve the application's stability, compatibility, and functionality on Wayland systems.

main.py

@@ -38,6 +38,17 @@ def main(argv: list[str] | None = None) -> int:
         )
         return 1
 
+    # Warn if GDK_BACKEND is set to X11 on Wayland systems
+    if os.environ.get("WAYLAND_DISPLAY") and os.environ.get("GDK_BACKEND") == "x11":
+        print(
+            "Warning: GDK_BACKEND is set to 'x11' but you're on Wayland.",
+            file=sys.stderr,
+        )
+        print(
+            "GTK4 Layer Shell requires native Wayland. Use './run.sh' instead.",
+            file=sys.stderr,
+        )
+
     app = Gtk.Application(application_id="ai.sidebar")
     app.connect("activate", _on_activate)
     status = app.run(args)