Linger on screen after release, keyviz-style

Previously the chips cleared the instant the keys were released, so the
120ms hide delay was invisible. Keep the last combo rendered for the
whole linger window and only clear it when the timer fires, so a quick
tap stays readable (keyviz keeps keys for lingerDurationMs, 5s by
default). Default 1000ms, tunable via lingerMs.

KeyVisualizer.qml

@@ -10,7 +10,7 @@ import qs.Ui
 // to the compositor's key events and writes the current combination to
 // $XDG_RUNTIME_DIR/omarchy-key-visualizer.json. This panel watches that file
 // and renders. No images, no animations: the combo appears while held and
-// disappears the moment the keys are released.
+// lingers briefly after release (like keyviz's Duration), then vanishes.
 //
 // On first load the panel also appends a small guarded block to
 // ~/.config/hypr/hyprland.lua that dofiles the capture script, so install
@@ -21,9 +21,10 @@ Item {
 
   property bool opened: false
   property var keys: []
-  // Grace period after the last key is released. Small enough to feel
-  // immediate, long enough that a quick tap is still readable.
-  property int hideDelayMs: 120
+  // How long the last combination stays on screen after the keys are
+  // released (keyviz's "Duration"; keyviz defaults to 5000ms). The combo
+  // lingers intact, then vanishes in one frame — no fade.
+  property int lingerMs: 1000
   // Drop state written more than this long ago (e.g. from a previous shell
   // session after a restart) so a stale combo never sticks on screen.
   readonly property int maxStateAgeMs: 1500
@@ -79,19 +80,24 @@ Item {
         if (age <= Math.ceil(root.maxStateAgeMs / 1000)) next = parsed.keys
       }
     } catch (e) {}
-    root.keys = next
     if (next.length === 0) {
+      // Keys were released: keep the last combo on screen for the linger
+      // window, then clear it. A fresh press restarts the timer below.
       hideTimer.restart()
     } else {
       hideTimer.stop()
+      root.keys = next
       root.opened = true
     }
   }
 
   Timer {
     id: hideTimer
-    interval: root.hideDelayMs
-    onTriggered: root.opened = false
+    interval: root.lingerMs
+    onTriggered: {
+      root.keys = []
+      root.opened = false
+    }
   }
 
   FileView {