Keep stay-awake dim on transient .inactive scene phase

Hemera/Screen/ScreenManager.swift

@@ -177,11 +177,18 @@ final class ScreenManager {
             if stayAwake && !isDimmed {
                 resetInactivityTimer()
             }
-        case .background, .inactive:
+        case .background:
             cancelInactivityTimer()
             if isDimmed {
                 isDimmed = false
             }
+        case .inactive:
+            /**
+             Transient interruptions (Control Center, Notification Center,
+             incoming calls) yield `.inactive` without backgrounding the app.
+             Keep the current dim state so it survives them.
+             */
+            break
         @unknown default:
             break
         }

HemeraTests/Screen/ScreenManagerTests.swift

@@ -1,3 +1,4 @@
+import SwiftUI
 import Testing
 @testable import Hemera
 
@@ -61,4 +62,26 @@ struct ScreenManagerTests {
         #expect(screenManager.isDimmed == true)
     }
 
+    // MARK: - Scene Phase
+
+    @Test func handleScenePhase_inactive_whileDimmed_keepsDim() {
+        screenManager.stayAwake = true
+        screenManager.executePreviewDim()
+        #expect(screenManager.isDimmed == true)
+
+        screenManager.handleScenePhase(.inactive)
+
+        #expect(screenManager.isDimmed == true)
+    }
+
+    @Test func handleScenePhase_background_whileDimmed_clearsDim() {
+        screenManager.stayAwake = true
+        screenManager.executePreviewDim()
+        #expect(screenManager.isDimmed == true)
+
+        screenManager.handleScenePhase(.background)
+
+        #expect(screenManager.isDimmed == false)
+    }
+
 }