fix(qml): TrackRow emits one playRequested per gesture

A double-click on a clickPlays row fired playRequested three times
(two releases plus doubleClicked) and restarted the track three times
within 230 ms. Debounce the release and skip the doubleClicked arm on
clickPlays rows.

cc

crates/qbz-qt/qml/rows/TrackRow.qml

@@ -99,6 +99,8 @@ Rectangle {
     property bool zebra: false
     property bool artistLink: false
     property bool clickPlays: true
+    // Debounce for clickPlays rows (see onReleased).
+    property real _lastPlayRequestMs: 0
     /// RETIRED and INERT. primitives/TrackRow.slint has exactly ONE quality
     /// form (the bare QualityBadgeFull below) — there was never an icon/text
     /// split to arm. Kept declared ONLY so the two existing call sites that
@@ -1554,7 +1556,18 @@ Rectangle {
             if (wasDragging) {
                 mouse.accepted = true
             } else if (root.clickPlays) {
-                root.playRequested()
+                // ONE play per gesture. A double-click is two releases plus
+                // the doubleClicked handler: three `playRequested`s within
+                // ~300 ms, i.e. three restarts of the same track (2026-08-29
+                // smoke: three "served from OFFLINE cache" in 230 ms). The
+                // second release inside the double-click window is dropped
+                // here; the doubleClicked arm below already yields to
+                // clickPlays rows.
+                const now = Date.now()
+                if (now - root._lastPlayRequestMs > 400) {
+                    root._lastPlayRequestMs = now
+                    root.playRequested()
+                }
             } else {
                 mouse.accepted = false
             }
@@ -1574,6 +1587,10 @@ Rectangle {
             // so the single-click block above is not enough on its own.
             if (root.pulledDead)
                 return
+            // A clickPlays row already played on the first release; a third
+            // emission here restarted the track a third time.
+            if (root.clickPlays)
+                return
             if (mouse.button === Qt.LeftButton)
                 root.playRequested()
         }