macos: unzoom on new split and focus change

macos/Sources/Features/Splits/SplitTree.swift

@@ -108,11 +108,12 @@ extension SplitTree {
     }
 
     /// Insert a new view at the given view point by creating a split in the given direction.
+    /// This will always reset the zoomed state of the tree.
     func insert(view: ViewType, at: ViewType, direction: NewDirection) throws -> Self {
         guard let root else { throw SplitError.viewNotFound }
         return .init(
             root: try root.insert(view: view, at: at, direction: direction),
-            zoomed: zoomed)
+            zoomed: nil)
     }
 
     /// Remove a node from the tree. If the node being removed is part of a split,

macos/Sources/Features/Terminal/BaseTerminalController.swift

@@ -451,6 +451,11 @@ class BaseTerminalController: NSWindowController,
             return
         }
 
+        // Remove the zoomed state for this surface tree.
+        if surfaceTree.zoomed != nil {
+            surfaceTree = .init(root: surfaceTree.root, zoomed: nil)
+        }
+
         // Move focus to the next surface
         Ghostty.moveFocus(to: nextSurface, from: target)
     }