feat(ground-suite): add system glass themes

ground-suite/lib/shared/widgets/glass_panel.dart

@@ -0,0 +1,121 @@
+import 'dart:ui';
+
+import 'package:flutter/material.dart';
+
+import '../../app/theme.dart';
+
+/// A bounded, translucent surface used for Ground Suite's data panels.
+///
+/// The blur is applied only inside the clipped panel, keeping the effect local
+/// to the UI rather than turning the whole desktop window into a filter.
+class GlassPanel extends StatelessWidget {
+  const GlassPanel({
+    required this.child,
+    super.key,
+    this.borderRadius = const BorderRadius.all(Radius.circular(16)),
+  });
+
+  final Widget child;
+  final BorderRadius borderRadius;
+
+  @override
+  Widget build(BuildContext context) {
+    return ClipRRect(
+      borderRadius: borderRadius,
+      child: BackdropFilter(
+        filter: ImageFilter.blur(sigmaX: 18, sigmaY: 18),
+        child: _GlassSurface(borderRadius: borderRadius, child: child),
+      ),
+    );
+  }
+}
+
+/// A scroll-friendly translucent panel without a backdrop filter.
+///
+/// Timeline rows use this surface so diagnostic volume does not turn into a
+/// growing set of expensive compositing layers.
+class GlassListItem extends StatelessWidget {
+  const GlassListItem({
+    required this.child,
+    super.key,
+    this.borderRadius = const BorderRadius.all(Radius.circular(16)),
+  });
+
+  final Widget child;
+  final BorderRadius borderRadius;
+
+  @override
+  Widget build(BuildContext context) =>
+      _GlassSurface(borderRadius: borderRadius, child: child);
+}
+
+class _GlassSurface extends StatelessWidget {
+  const _GlassSurface({required this.child, required this.borderRadius});
+
+  final Widget child;
+  final BorderRadius borderRadius;
+
+  @override
+  Widget build(BuildContext context) {
+    final scheme = Theme.of(context).colorScheme;
+    final isDark = scheme.brightness == Brightness.dark;
+    final fill = isDark ? const Color(0xb30a0a0a) : const Color(0xc9ffffff);
+    final border = isDark
+        ? scheme.primary.withValues(alpha: 0.24)
+        : scheme.outline.withValues(alpha: 0.7);
+
+    return DecoratedBox(
+      decoration: BoxDecoration(
+        color: fill,
+        border: Border.all(color: border),
+        borderRadius: borderRadius,
+        boxShadow: [
+          BoxShadow(
+            color: Colors.black.withValues(alpha: isDark ? 0.24 : 0.08),
+            blurRadius: 24,
+            offset: const Offset(0, 10),
+          ),
+        ],
+      ),
+      child: child,
+    );
+  }
+}
+
+class OrkavianBackdrop extends StatelessWidget {
+  const OrkavianBackdrop({required this.child, super.key});
+
+  final Widget child;
+
+  @override
+  Widget build(BuildContext context) {
+    final isDark = Theme.of(context).brightness == Brightness.dark;
+    final base = isDark ? const Color(0xff050505) : const Color(0xffeef3ee);
+    final haze = isDark
+        ? orkavianGreen.withValues(alpha: 0.1)
+        : const Color(0xff007a2e).withValues(alpha: 0.07);
+
+    return ColoredBox(
+      color: base,
+      child: Stack(
+        children: [
+          Positioned(
+            top: -260,
+            right: -220,
+            child: IgnorePointer(
+              child: Container(
+                width: 620,
+                height: 620,
+                decoration: BoxDecoration(
+                  shape: BoxShape.circle,
+                  gradient: RadialGradient(colors: [haze, Colors.transparent]),
+                ),
+              ),
+            ),
+          ),
+          Positioned.fill(child: child),
+        ],
+      ),
+    );
+  }
+}