test sweep: icons, log.trace, DialogHost, FilesDropped getters (T-91)

Three small additions to push coverage toward the 90% target:

- test/widgets/icons_test.dart: one sweep test calling .paint() on
  every custom ClideIconPainter (Check, ChevronRight, ChevronDown,
  Dot, Folder, Gear, GitBranch, Plug, Search, Terminal, Warning).
- log_test: Logger.trace covered at minLevel.trace + filtered out
  at minLevel.info.
- services_bigger_test: DialogRouter.current getter; DialogHost
  widget rendered with backdrop + inner builder, then dismissed
  through the router. Plus FilesDropped subsystem/kind getters
  exercised through the existing notifyDropped test.

Coverage 89.08% -> 89.93%.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

test/kernel/src/log_test.dart

@@ -67,5 +67,18 @@ void main() {
       expect(a, hasLength(1));
       expect(b, hasLength(1));
     });
+
+    test('trace records emit at minLevel.trace + are filtered above it', () {
+      final got = <LogRecord>[];
+      final log = Logger(minLevel: LogLevel.trace, sinks: [got.add]);
+      log.trace('s', 'low-level detail');
+      expect(got, hasLength(1));
+      expect(got.first.level, LogLevel.trace);
+      // Same call at info-level is filtered.
+      got.clear();
+      final filtered = Logger(minLevel: LogLevel.info, sinks: [got.add]);
+      filtered.trace('s', 'still detail');
+      expect(got, isEmpty);
+    });
   });
 }

test/kernel/src/services_bigger_test.dart

@@ -52,6 +52,46 @@ void main() {
       r.dismiss(1); // close
       expect(calls, 2);
     });
+
+    test('current getter exposes the active builder while open', () {
+      final r = DialogRouter();
+      expect(r.current, isNull);
+      r.show<int>((ctx, _) => const SizedBox());
+      expect(r.current, isNotNull);
+      r.dismiss();
+      expect(r.current, isNull);
+    });
+
+    testWidgets('DialogHost renders the child + the dialog over a backdrop', (tester) async {
+      final r = DialogRouter();
+      await tester.pumpWidget(Directionality(
+        textDirection: TextDirection.ltr,
+        child: DialogHost(
+          router: r,
+          child: const ColoredBox(color: Color(0xFF111111), child: SizedBox.expand()),
+        ),
+      ));
+      await tester.pump();
+      // No dialog open yet — backdrop + modal not present.
+      expect(find.byType(GestureDetector), findsNothing);
+      // Open one.
+      final future = r.show<String>((ctx, dismiss) {
+        return GestureDetector(
+          onTap: () => dismiss('inner'),
+          child: const SizedBox(width: 100, height: 100),
+        );
+      });
+      await tester.pump();
+      // Backdrop + inner-wrapper + my own each add a GestureDetector.
+      expect(find.byType(GestureDetector), findsAtLeast(2));
+      // Dismiss programmatically — the future completes with null.
+      r.dismiss();
+      final result = await future;
+      expect(result, isNull);
+      // After dismiss, no GestureDetector remains.
+      await tester.pump();
+      expect(find.byType(GestureDetector), findsNothing);
+    });
   });
 
   group('FileServices stub', () {
@@ -70,6 +110,8 @@ void main() {
       final e = await got.timeout(const Duration(seconds: 1));
       expect(e.paths, ['/a.txt', '/b.txt']);
       expect(e.slot, Slots.workspace);
+      expect(e.subsystem, 'files');
+      expect(e.kind, 'dropped');
       expect(e.payload()['slot'], Slots.workspace.value);
     });
   });

test/widgets/icons_test.dart

@@ -0,0 +1,43 @@
+/// Smoke tests for the custom paint icons under `lib/widgets/src/icons/`.
+/// Each paint() call runs against a real PictureRecorder canvas to verify
+/// it doesn't throw and to fill in lcov.
+library;
+
+import 'dart:ui';
+
+import 'package:clide/widgets/src/icons/check.dart';
+import 'package:clide/widgets/src/icons/chevron.dart';
+import 'package:clide/widgets/src/icons/dot.dart';
+import 'package:clide/widgets/src/icons/folder.dart';
+import 'package:clide/widgets/src/icons/gear.dart';
+import 'package:clide/widgets/src/icons/git_branch.dart';
+import 'package:clide/widgets/src/icons/plug.dart';
+import 'package:clide/widgets/src/icons/search.dart';
+import 'package:clide/widgets/src/icons/terminal_icon.dart';
+import 'package:clide/widgets/src/icons/warning.dart';
+import 'package:test/test.dart';
+
+Canvas _canvas() => Canvas(PictureRecorder());
+
+void main() {
+  const color = Color(0xFF000000);
+
+  test('every custom icon painter renders without throwing', () {
+    const painters = [
+      CheckIcon(),
+      ChevronRightIcon(),
+      ChevronDownIcon(),
+      DotIcon(),
+      FolderIcon(),
+      GearIcon(),
+      GitBranchIcon(),
+      PlugIcon(),
+      SearchIcon(),
+      TerminalIcon(),
+      WarningIcon(),
+    ];
+    for (final p in painters) {
+      p.paint(_canvas(), color);
+    }
+  });
+}