feat: show stippled centering guides while dragging launcher

Sources/Conjure/LauncherWindowController.swift

@@ -15,6 +15,7 @@ final class LauncherWindowController: NSWindowController, NSWindowDelegate, NSSe
     private var discoveryTask: Task<Void, Never>?
     private var isLaunching = false
     private var previousApplication: NSRunningApplication?
+    private var alignmentGuides: LauncherAlignmentGuides?
 
     init(history: LaunchHistory = LaunchHistory()) {
         self.history = history
@@ -39,6 +40,7 @@ final class LauncherWindowController: NSWindowController, NSWindowDelegate, NSSe
         window.delegate = self
         window.navigateSelection = { [weak self] offset in self?.moveSelection(by: offset) }
         window.dismiss = { [weak self] in self?.dismiss() }
+        window.dragEnded = { [weak self] in self?.alignmentGuides?.end() }
     }
 
     required init?(coder: NSCoder) {
@@ -72,6 +74,7 @@ final class LauncherWindowController: NSWindowController, NSWindowDelegate, NSSe
 
     func dismiss(restoringFocus: Bool = true) {
         guard !restoringFocus || (!isLaunching && window?.attachedSheet == nil) else { return }
+        alignmentGuides?.end()
         let previous = previousApplication
         previousApplication = nil
         window?.orderOut(nil)
@@ -81,6 +84,18 @@ final class LauncherWindowController: NSWindowController, NSWindowDelegate, NSSe
         }
     }
 
+    func windowWillMove(_ notification: Notification) {
+        guard let window else { return }
+        let guides = alignmentGuides ?? LauncherAlignmentGuides()
+        alignmentGuides = guides
+        guides.begin(for: window)
+    }
+
+    func windowDidMove(_ notification: Notification) {
+        guard let window else { return }
+        alignmentGuides?.update(for: window)
+    }
+
     func windowDidResignKey(_ notification: Notification) {
         guard !isLaunching, window?.attachedSheet == nil else { return }
         dismiss(restoringFocus: false)
@@ -473,6 +488,7 @@ private final class LauncherPanel: NSPanel {
     override var canBecomeMain: Bool { true }
     var navigateSelection: ((Int) -> Void)?
     var dismiss: (() -> Void)?
+    var dragEnded: (() -> Void)?
 
     override func sendEvent(_ event: NSEvent) {
         if event.type == .keyDown, attachedSheet == nil,
@@ -489,6 +505,9 @@ private final class LauncherPanel: NSPanel {
             }
         }
         super.sendEvent(event)
+        if event.type == .leftMouseDown || event.type == .leftMouseUp {
+            dragEnded?()
+        }
     }
 
     override func performClose(_ sender: Any?) {