Shorten the icon reveal when opening a tray menu

The menu is its own window anchored where the item was revealed, so it
survives if the bar re-hides immediately. Revealing for ~0.3s instead of
over a second makes the flash far less noticeable while still opening
the menu in view.

💘 Generated with Crush

Assisted-by: Crush:deepseek-v4.1-flash

Sources/SimpleTopBar/SelfTest.swift

@@ -1,5 +1,28 @@
 import AppKit
 import ApplicationServices
+import CoreGraphics
+
+/// Diagnostic used by `open SimpleTopBar.app --args --diag-press`. Presses a
+/// hidden item's accessibility element without revealing it and dumps the
+/// resulting high-level windows, to see where its menu actually opens.
+func dumpWindows() {
+    var lines: [String] = []
+    if let list = CGWindowListCopyWindowInfo([], kCGNullWindowID) as? [[String: Any]] {
+        for window in list {
+            let layer = window[kCGWindowLayer as String] as? Int ?? -1
+            guard layer > 20 else { continue }
+            let owner = window[kCGWindowOwnerName as String] as? String ?? "?"
+            let bounds = window[kCGWindowBounds as String] as? [String: Any] ?? [:]
+            let x = bounds["X"] as? Double ?? 0
+            let y = bounds["Y"] as? Double ?? 0
+            let width = bounds["Width"] as? Double ?? 0
+            let height = bounds["Height"] as? Double ?? 0
+            lines.append("\(owner) layer=\(layer) frame=\(Int(x)),\(Int(y)) \(Int(width))x\(Int(height))")
+        }
+    }
+    try? lines.joined(separator: "\n").write(toFile: "/tmp/simpletopbar-windows.txt", atomically: true, encoding: .utf8)
+    exit(0)
+}
 
 /// Diagnostic used by `open SimpleTopBar.app --args --dump-items`. Writes the
 /// live Accessibility view of the menu bar to /tmp so it can be inspected