fix theme picker integration test; one bake for build-time facts (T-116)

The test was awaiting services.commands.execute('theme.pick') whose
Future doesn't complete until the dialog is dismissed — deadlock.
Fire-and-forget around pumpAndSettle, then tap Cancel, then await
the original future. Also tear the widget tree down before
services.dispose() so listening widgets unsubscribe first.

Pre-existing layout overflow in the welcome _StatusLine surfaced
when running the test at narrower viewports. Switched to a whole-
row FittedBox(scaleDown) — uniform shrink on narrow screens, no-op
at standard widths.

User flagged the hardcoded 'clide 2.0.0-dev' string. Replaced with
one generated lib/src/build_info.g.dart (gitignored, regenerated
by `make gen-build-info` from pubspec.yaml + git short SHA + UTC
clock). The same target re-syncs assets/licenses.yaml self.version
in place — no second source. Every make build/run/test depends on
it implicitly. Welcome status line now reads `clideVersion`. Stale
fontSize literals in welcome_view swept to typography constants;
clideFontMeta=13, clideFontDialogTitle=16, clideFontWelcomeBanner=52
added to fill gaps in the scale.

Co-Authored-By: Claude <noreply@anthropic.com>

integration_test/theme_picker_test.dart

@@ -6,6 +6,7 @@ import 'package:clide/builtin/theme_picker/theme_picker.dart';
 import 'package:clide/builtin/welcome/welcome.dart';
 import 'package:clide/kernel/kernel.dart';
 import 'package:flutter/services.dart' show rootBundle;
+import 'package:flutter/widgets.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:integration_test/integration_test.dart';
 
@@ -39,21 +40,39 @@ void main() {
       ..register(ThemePickerExtension());
     await services.extensions.activateAll();
 
+    // Larger viewport so the welcome screen's _StatusLine row doesn't
+    // overflow on the default ~800x600 — that overflow throws a layout
+    // assertion that fails the test before we get to theme.pick.
+    tester.view.physicalSize = const Size(1200, 800);
+    tester.view.devicePixelRatio = 1.0;
+    addTearDown(tester.view.resetPhysicalSize);
+    addTearDown(tester.view.resetDevicePixelRatio);
+
     await tester.pumpWidget(ClideApp(services: services));
     await tester.pumpAndSettle();
 
-    // Invoke the command.
-    await services.commands.execute('theme.pick');
+    // Fire-and-forget: theme.pick's run handler awaits
+    // ctx.dialog.show(...), whose Future doesn't complete until the
+    // dialog is dismissed. Awaiting here would deadlock the test
+    // before the dialog ever mounts.
+    final pending = services.commands.execute('theme.pick');
     await tester.pumpAndSettle();
 
     expect(find.text('Select theme'), findsOneWidget);
     expect(find.text('Cancel'), findsOneWidget);
 
-    // Dismiss via Cancel.
+    // Dismiss via Cancel — this completes the pending future above.
     await tester.tap(find.text('Cancel'));
     await tester.pumpAndSettle();
     expect(find.text('Select theme'), findsNothing);
+    await pending;
 
+    // Tear the widget tree down BEFORE disposing services so widgets
+    // that listen to kernel notifiers (KeymapService, etc.) unsubscribe
+    // first. Disposing services while the tree is mounted triggers
+    // "ChangeNotifier used after dispose" during teardown rebuilds.
+    await tester.pumpWidget(const SizedBox.shrink());
+    await tester.pumpAndSettle();
     await services.dispose();
   });
 }