fix(touch): remove unsupported power icon, make delete button red

- Remove ⏻ icon from Shutdown Pi button (not in Pi fonts)
- Change delete playlist button to always red (#dc2626)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

dune-weaver-touch/qml/pages/ModernPlaylistPage.qml

@@ -338,7 +338,7 @@ Page {
                     Text {
                         text: "✕"
                         font.pixelSize: 20
-                        color: deletePlaylistMouseArea.pressed ? "#dc2626" : Components.ThemeManager.textSecondary
+                        color: deletePlaylistMouseArea.pressed ? "#991b1b" : "#dc2626"
 
                         MouseArea {
                             id: deletePlaylistMouseArea

dune-weaver-touch/qml/pages/TableControlPage.qml

@@ -622,7 +622,7 @@ Page {
                                 Layout.fillWidth: true
                                 Layout.preferredHeight: 45
                                 text: "Shutdown Pi"
-                                icon: "⏻"
+                                icon: ""
                                 buttonColor: "#dc2626"
                                 fontSize: 11