refactor(qml): extract sidebar panels and data tab comparison cards to modular components

src/pygui/ISC/Tabs/components/SectionTitle.qml

@@ -0,0 +1,12 @@
+import QtQuick
+import QtQuick.Controls
+import ISC
+
+// Uppercase card heading — shared by the Data tab cards.
+Label {
+    font.family: Theme.uiFontFamily
+    font.pixelSize: Theme.fontSm
+    font.letterSpacing: 1.5
+    font.bold: true
+    color: Theme.sideMutedText
+}