feat: video/state_machine unit tests and on_video_completed logic fix

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/plugins/screen/mod.rs

@@ -28,7 +28,8 @@ impl ScreenPlugin {
         }
 
         match Command::new("systemd-inhibit")
-            .arg("--what=idle")
+            .arg("--what=idle:sleep")
+            .arg("--mode=block")
             .arg("--who=ShowenV2")
             .arg("--why=Prevent screen lock during playback")
             .arg("sleep")
@@ -66,6 +67,13 @@ impl ScreenPlugin {
         }
 
         if hidden {
+            let _ = Command::new("pkill")
+                .args(["-f", "unclutter"])
+                .stdin(Stdio::null())
+                .stdout(Stdio::null())
+                .stderr(Stdio::null())
+                .status();
+
             match Command::new("unclutter")
                 .arg("-idle")
                 .arg("0")
@@ -80,7 +88,7 @@ impl ScreenPlugin {
             }
         } else {
             match Command::new("pkill")
-                .arg("unclutter")
+                .args(["-f", "unclutter"])
                 .stdin(Stdio::null())
                 .stdout(Stdio::null())
                 .stderr(Stdio::null())
@@ -118,6 +126,10 @@ impl Plugin for ScreenPlugin {
         }
     }
 
+    fn dependencies(&self) -> Vec<&'static str> {
+        vec![]
+    }
+
     fn init(&mut self, ctx: PluginContext) -> Result<()> {
         self.ctx = Some(ctx);
         Ok(())