BarWidgets: First pass on contextual widget menu accessible from right-click.

Testing on volume widget for now.

Services/UI/BarService.qml

@@ -244,4 +244,54 @@ Singleton {
       return "bottom";
     }
   }
+
+  // Calculate context menu position based on bar position
+  // Parameters:
+  //   anchorItem: The widget item to anchor the menu to
+  //   menuWidth: Width of the context menu (optional, defaults to 180)
+  //   menuHeight: Height of the context menu (optional, defaults to 100)
+  // Returns: { x: number, y: number }
+  // Note: Anchor position is top-left corner, so we calculate from center
+  function getContextMenuPosition(anchorItem, menuWidth, menuHeight) {
+    if (!anchorItem) {
+      Logger.w("BarService", "getContextMenuPosition: anchorItem is null");
+      return {
+        "x": 0,
+        "y": 0
+      };
+    }
+
+    const mWidth = menuWidth || 180;
+    const mHeight = menuHeight || 100;
+    const barPosition = Settings.data.bar.position;
+    let menuX = 0;
+    let menuY = 0;
+
+    // Calculate center-based positioning for consistent spacing
+    const anchorCenterX = anchorItem.width / 2;
+    const anchorCenterY = anchorItem.height / 2;
+
+    if (barPosition === "left") {
+      // For left bar: position menu to the right of anchor, vertically centered
+      menuX = anchorItem.width + Style.marginM;
+      menuY = anchorCenterY - (mHeight / 2);
+    } else if (barPosition === "right") {
+      // For right bar: position menu to the left of anchor, vertically centered
+      menuX = -mWidth - Style.marginM;
+      menuY = anchorCenterY - (mHeight / 2);
+    } else if (barPosition === "top") {
+      // For top bar: position menu below bar, horizontally centered
+      menuX = anchorCenterX - (mWidth / 2);
+      menuY = Style.barHeight;
+    } else {
+      // For bottom bar: position menu above, horizontally centered
+      menuX = anchorCenterX - (mWidth / 2);
+      menuY = -mHeight - Style.marginM;
+    }
+
+    return {
+      "x": menuX,
+      "y": menuY
+    };
+  }
 }