fix: align animation mergeIcons check with shouldMergeIcons property

updateBlinkingState() computed mergeIcons independently using the
availability-filtered list, diverging from shouldMergeIcons which now
uses the display list. Reuse the property to keep a single source of
truth.

Author: Astro-Han

Sources/CodexBar/StatusItemController+Animation.swift

@@ -27,7 +27,7 @@ extension StatusItemController {
         let enabledProviders = self.store.enabledProviders()
         let anyEnabled = !enabledProviders.isEmpty || self.store.debugForceAnimation
         let anyVisible = UsageProvider.allCases.contains { self.isVisible($0) }
-        let mergeIcons = self.settings.mergeIcons && enabledProviders.count > 1
+        let mergeIcons = self.shouldMergeIcons
         let shouldBlink = mergeIcons ? anyEnabled : anyVisible
         if blinkingEnabled, shouldBlink {
             if self.blinkTask == nil {