config: quick terminal auto hide

Introduce a setting allowing to customize the behavior of the quick terminal
when it loses focus. By default, the quick terminal will automatically hide.
However, you can now configure it to remain open by setting
`quick-terminal-autohide: false`.

Resolves #2558

macos/Sources/Features/QuickTerminal/QuickTerminalController.swift

@@ -107,7 +107,9 @@ class QuickTerminalController: BaseTerminalController {
             self.previousApp = nil
         }
 
-        animateOut()
+        if (derivedConfig.quickTerminalAutoHide) {
+            animateOut()
+        }
     }
 
     func windowWillResize(_ sender: NSWindow, to frameSize: NSSize) -> NSSize {
@@ -395,15 +397,18 @@ class QuickTerminalController: BaseTerminalController {
     private struct DerivedConfig {
         let quickTerminalScreen: QuickTerminalScreen
         let quickTerminalAnimationDuration: Double
+        let quickTerminalAutoHide: Bool
 
         init() {
             self.quickTerminalScreen = .main
             self.quickTerminalAnimationDuration = 0.2
+            self.quickTerminalAutoHide = true
         }
 
         init(_ config: Ghostty.Config) {
             self.quickTerminalScreen = config.quickTerminalScreen
             self.quickTerminalAnimationDuration = config.quickTerminalAnimationDuration
+            self.quickTerminalAutoHide = config.quickTerminalAutoHide
         }
     }
 }