fix: show direct connection and pairing modal content on tablets (#211)

On tablet-sized layouts the welcome-screen modals for direct connection and pair link could collapse so only the header row remained visible.

Adjust the desktop modal card and scroll container flex behavior so the modal body can shrink within the available height and remain visible instead of being clipped out.

packages/app/src/components/adaptive-modal-sheet.tsx

@@ -28,6 +28,8 @@ const styles = StyleSheet.create((theme) => ({
     width: "100%",
     maxWidth: 520,
     maxHeight: "85%",
+    flexShrink: 1,
+    minHeight: 0,
     backgroundColor: theme.colors.surface1,
     borderRadius: theme.borderRadius.xl,
     borderWidth: 1,
@@ -54,11 +56,13 @@ const styles = StyleSheet.create((theme) => ({
     backgroundColor: theme.colors.surface2,
   },
   desktopScroll: {
-    flex: 1,
+    flexShrink: 1,
+    minHeight: 0,
   },
   desktopContent: {
     padding: theme.spacing[6],
     gap: theme.spacing[4],
+    flexGrow: 1,
   },
   bottomSheetHandle: {
     backgroundColor: theme.colors.surface2,