fix: lock action calls moonlock directly instead of loginctl

loginctl lock-session requires a D-Bus listener that is
difficult to set up reliably. Direct moonlock invocation
is simpler and works immediately.
Also removes CSS fade-in animation (low-fps on layer shell).

src/moonset/power.py

@@ -8,8 +8,8 @@ POWER_TIMEOUT = 30
 
 
 def lock() -> None:
-    """Lock the current session via loginctl."""
-    subprocess.run(["loginctl", "lock-session"], check=True, timeout=POWER_TIMEOUT)
+    """Lock the current session by launching moonlock."""
+    subprocess.run(["moonlock"], check=True, timeout=POWER_TIMEOUT)
 
 
 def logout() -> None:

src/moonset/style.css

@@ -6,23 +6,11 @@ window.panel {
     background-color: @theme_bg_color;
     background-size: cover;
     background-position: center;
-    opacity: 0;
-    transition: opacity 350ms ease-in;
-}
-
-window.panel.visible {
-    opacity: 1;
 }
 
 /* Wallpaper-only window for secondary monitors */
 window.wallpaper {
     background-color: @theme_bg_color;
-    opacity: 0;
-    transition: opacity 350ms ease-in;
-}
-
-window.wallpaper.visible {
-    opacity: 1;
 }
 
 /* Round avatar image */