fix(ui): address main window KDE HIG findings

src/qml/Main.qml

@@ -50,10 +50,10 @@ ApplicationWindow {
 
     visible: true
     title: video.mediaTitle || KI18n.i18nc("@title:window", "QtPotato")
-    width: 1000
-    height: 600
-    minimumWidth: 400
-    minimumHeight: 200
+    width: Kirigami.Units.gridUnit * 55
+    height: Kirigami.Units.gridUnit * 33
+    minimumWidth: Kirigami.Units.gridUnit * 23
+    minimumHeight: Kirigami.Units.gridUnit * 11
     color: Kirigami.Theme.backgroundColor
 
     onVisibilityChanged: visibility => {
@@ -180,7 +180,7 @@ ApplicationWindow {
             if (!QtPotatoSettings.playlistToggleWithMouse) {
                 return
             }
-            const atEdge = playlistPanel.edge === Qt.RightEdge ? x > width - 50 : x < 50
+            const atEdge = playlistPanel.edge === Qt.RightEdge ? x > width - Kirigami.Units.gridUnit * 3 : x < Kirigami.Units.gridUnit * 3
             playlistPanel.state = atEdge ? "visible" : "hidden"
         }
         onPointerLeft: footerItem.pointerLeft()
@@ -266,11 +266,10 @@ ApplicationWindow {
 
     InputPopup {
         id: openUrlPopup
-        x: Kirigami.Units.largeSpacing
-        y: Kirigami.Units.largeSpacing
-        width: Math.min(appWindow.width * 0.9, 600)
+        title: KI18n.i18nc("@title:window", "Open URL")
+        preferredWidth: Kirigami.Units.gridUnit * 30
         lastText: QtPotatoSettings.lastUrl
-        placeholderText: "https://"
+        placeholderText: "https://example.org/video.mkv"
         buttonText: KI18n.i18nc("@action:button", "Open")
         onSubmitted: text => {
             QtPotatoSettings.lastUrl = text