Chat View Refinement

Nucleic-Session: 4E56990A-96AE-4597-9140-753CB82E769D
Co-authored-by: Nucleic <[email protected]>

NucleicRemote/NucleicRemote/Views/Theme.swift

@@ -313,6 +313,25 @@ struct KeyboardDismissable: ViewModifier {
     }
 }
 
+/// A floating Liquid Glass surface for bars that hover over scrolling content (the session
+/// chat bar, approval card). Real `glassEffect` on iOS 26; an ultra-thin material with a
+/// hairline edge on earlier systems so the bar still reads as a translucent layer.
+struct GlassSurface: ViewModifier {
+    var cornerRadius: CGFloat = 24
+    func body(content: Content) -> some View {
+        if #available(iOS 26.0, *) {
+            content.glassEffect(.regular, in: .rect(cornerRadius: cornerRadius, style: .continuous))
+        } else {
+            content
+                .background(.ultraThinMaterial,
+                            in: RoundedRectangle(cornerRadius: cornerRadius, style: .continuous))
+                .overlay(
+                    RoundedRectangle(cornerRadius: cornerRadius, style: .continuous)
+                        .strokeBorder(Color.primary.opacity(0.08), lineWidth: 1))
+        }
+    }
+}
+
 /// A lifted card surface with a hairline border — the mobile echo of `AppTheme.surface`.
 struct CardBackground: ViewModifier {
     var padding: CGFloat = 14