C1: NotifItem QtObject with owned timer, refactor service to stable identities

modules/NotifItem.qml

@@ -0,0 +1,67 @@
+import QtQuick
+import Quickshell.Services.Notifications
+import "." as M
+
+QtObject {
+    id: root
+
+    property bool popup: false
+    property string state: "visible" // "visible" | "dismissing" | "dismissed"
+
+    property var notification: null
+    property var id
+    property string summary
+    property string body
+    property string appName
+    property string appIcon
+    property string image
+    property var hints
+    property int urgency: NotificationUrgency.Normal
+    property var actions: []
+    property real time: Date.now()
+
+    // Expire timer — owned by this item, not dynamically created
+    readonly property Timer _expireTimer: Timer {
+        running: false
+        onTriggered: {
+            if (root.state === "visible")
+                root.popup = false;
+        }
+    }
+
+    // Relative time string
+    property string timeStr: "now"
+    readonly property Timer _timeStrTimer: Timer {
+        running: root.state !== "dismissed"
+        repeat: true
+        interval: 5000
+        onTriggered: root._updateTimeStr()
+    }
+
+    function _updateTimeStr() {
+        const diff = Date.now() - time;
+        const m = Math.floor(diff / 60000);
+        if (m < 1) {
+            timeStr = "now";
+            return;
+        }
+        const h = Math.floor(m / 60);
+        if (h < 1) {
+            timeStr = m + "m";
+            return;
+        }
+        const d = Math.floor(h / 24);
+        timeStr = d > 0 ? d + "d" : h + "h";
+    }
+
+    function beginDismiss() {
+        if (state === "visible")
+            state = "dismissing";
+    }
+
+    function finishDismiss() {
+        state = "dismissed";
+        _expireTimer.running = false;
+        notification?.dismiss();
+    }
+}