Dead code removal 2 (#78)

* fix: remove dead code from kit/ and InstanceDialog

Remove unused code identified by deep scan:
- Delete kit/core/func.dart (Fns.throttle unused)
- Delete kit/core/build.dart (BuildMode unused after dprint removal)
- Delete kit/core/ext/string.dart (StringX.launchUrl unused)
- Remove dprint/lprint and unused Loggers.root/store/route/app from logger.dart
- Remove nullOr() extension and nvn() function from obj.dart
- Remove RNodeX.listen(), ValBuilder, listenVal(), EmptyListenable, RNodes from rnode.dart
- Remove WindowFrameConfig.setShowCaption() (never called)
- Remove unused platform constants: isAndroid, isIOS, isWeb, isMobile
- Remove ~20 unused UIs style constants (keep textGrey, textRed, text15, placeholder, height13)
- Remove InstanceDialog.onSave parameter and dead branch in _submit
- Clean up barrel exports in kit.dart

* perf: optimize sort comparator and fix empty setState callbacks

Performance:
- Extract _statusOrder Map to static const (avoids allocation per comparison)
- Extract _compareIgnoreCase helper for case-insensitive sort

Code quality:
- Move _pruneSelection mutation inside setState callback
- Move peers fetch state mutations inside setState in task_details_dialog
- Remove no-op empty setState in instance_dialog host/port onChange handlers

* fix: peers fetch setState after dispose and isLoadingPeers leak

- Replace early return on instance==null with local error variable
- Move setState into finally block with context.mounted guard
- Use local peersResult/peersErrorLocal to avoid duplicated setState

Author: GT-610

lib/kit/core/build.dart

@@ -5,9 +5,5 @@ extension ObjectX<T extends Object> on T {
 }
 
 extension ObjectXNullable<T extends Object> on T? {
-  A? nullOr<A>(A Function(T) f) => this != null ? f(this!) : null;
-
   VNode<T?> get vn => VNode<T?>(this);
 }
-
-VNode<T?> nvn<T>() => VNode<T?>(null);

lib/kit/core/ext/obj.dart

@@ -1,15 +1,6 @@
 import 'dart:io';
 
-import 'package:logging/logging.dart';
-
-import 'build.dart';
-
 abstract final class Loggers {
-  static final root = Logger('Root');
-  static final store = Logger('Store');
-  static final route = Logger('Route');
-  static final app = Logger('App');
-
   static final sourceReg = RegExp(r'\((.+):(\d+):(\d+)\)');
 
   static void log(Object message, {int skipFrames = 1}) {
@@ -35,31 +26,3 @@ abstract final class Loggers {
     print(message);
   }
 }
-
-void dprint(Object? msg, [Object? msg2, Object? msg3, Object? msg4]) {
-  if (!BuildMode.isDebug) return;
-  lprint(msg, msg2, msg3, msg4, 3);
-}
-
-void lprint(
-  Object? msg, [
-  Object? msg2,
-  Object? msg3,
-  Object? msg4,
-  int skipFrames = 2,
-]) {
-  final sb = StringBuffer();
-  sb.write(msg.toString());
-
-  if (msg2 != null) {
-    sb.write('\n$msg2');
-    if (msg3 != null) {
-      sb.write('\n$msg3');
-      if (msg4 != null) {
-        sb.write('\n$msg4');
-      }
-    }
-  }
-  final str = sb.toString();
-  Loggers.log(str, skipFrames: skipFrames);
-}

lib/kit/core/ext/string.dart

@@ -38,12 +38,8 @@ enum Pfs {
   }();
 }
 
-final isAndroid = Pfs.type == Pfs.android;
-final isIOS = Pfs.type == Pfs.ios;
 final isLinux = Pfs.type == Pfs.linux;
 final isMacOS = Pfs.type == Pfs.macos;
 final isWindows = Pfs.type == Pfs.windows;
-final isWeb = Pfs.type == Pfs.web;
-final isMobile = Pfs.type == Pfs.ios || Pfs.type == Pfs.android;
 final isDesktop =
     Pfs.type == Pfs.linux || Pfs.type == Pfs.macos || Pfs.type == Pfs.windows;

lib/kit/core/func.dart

@@ -50,12 +50,6 @@ class RNode implements ChangeNotifier {
   }
 }
 
-extension RNodeX on RNode {
-  ListenBuilder listen(Widget Function() builder) {
-    return ListenBuilder(listenable: this, builder: builder);
-  }
-}
-
 class VNode<T> extends RNode implements ValueNotifier<T> {
   T _value;
 
@@ -74,45 +68,3 @@ class VNode<T> extends RNode implements ValueNotifier<T> {
   @override
   String toString() => 'VNode($value)';
 }
-
-extension ValueListenableX<T> on ValueListenable<T> {
-  ValBuilder<T> listenVal(Widget Function(T) builder) {
-    return ValBuilder<T>(listenable: this, builder: builder);
-  }
-}
-
-final class ValBuilder<T> extends ValueListenableBuilder<T> {
-  final ValueListenable<T> listenable;
-
-  ValBuilder({
-    super.key,
-    required this.listenable,
-    required Widget Function(T) builder,
-  }) : super(valueListenable: listenable, builder: (_, val, _) => builder(val));
-}
-
-final class ListenBuilder extends ListenableBuilder {
-  ListenBuilder({
-    super.key,
-    required super.listenable,
-    required Widget Function() builder,
-  }) : super(builder: (_, _) => builder());
-}
-
-final class EmptyListenable<T> implements ValueListenable<T?> {
-  @override
-  void addListener(VoidCallback listener) {}
-
-  @override
-  void removeListener(VoidCallback listener) {}
-
-  @override
-  T? get value => null;
-
-  const EmptyListenable();
-}
-
-abstract final class RNodes {
-  static final app = RNode();
-  static final dark = VNode<bool>(false);
-}

lib/kit/core/logger.dart

@@ -1,11 +1,8 @@
 library;
 
-export 'core/build.dart';
 export 'core/ext/datetime.dart';
 export 'core/ext/obj.dart';
-export 'core/ext/string.dart';
 export 'core/ext/widget.dart';
-export 'core/func.dart';
 export 'core/logger.dart';
 export 'core/platform.dart';
 export 'core/rnode.dart';

lib/kit/core/platform.dart

@@ -1,55 +1,10 @@
 import 'package:flutter/material.dart';
 
 abstract final class UIs {
-  static const text11 = TextStyle(fontSize: 11);
-  static const text11Bold = TextStyle(
-    fontSize: 11,
-    fontWeight: FontWeight.w500,
-  );
-  static const text11Grey = TextStyle(color: Colors.grey, fontSize: 11);
-  static const text12 = TextStyle(fontSize: 12);
-  static const text12Bold = TextStyle(
-    fontSize: 12,
-    fontWeight: FontWeight.bold,
-  );
-  static const text12Grey = TextStyle(color: Colors.grey, fontSize: 12);
-  static const text13 = TextStyle(fontSize: 13);
-  static const text13Bold = TextStyle(
-    fontSize: 13,
-    fontWeight: FontWeight.bold,
-  );
-  static const text13Grey = TextStyle(color: Colors.grey, fontSize: 13);
   static const text15 = TextStyle(fontSize: 15);
-  static const text15Bold = TextStyle(
-    fontSize: 15,
-    fontWeight: FontWeight.bold,
-  );
-  static const text18 = TextStyle(fontSize: 18);
-  static const text27 = TextStyle(fontSize: 27);
   static const textGrey = TextStyle(color: Colors.grey);
   static const textRed = TextStyle(color: Colors.red);
 
   static const placeholder = SizedBox();
-  static const height7 = SizedBox(height: 7);
   static const height13 = SizedBox(height: 13);
-  static const height77 = SizedBox(height: 77);
-  static const width7 = SizedBox(width: 7);
-  static const width13 = SizedBox(width: 13);
-
-  static Widget dot({Color? color, double? size}) => Container(
-    width: size ?? 7,
-    height: size ?? 7,
-    decoration: BoxDecoration(
-      color: color ?? primaryColor,
-      shape: BoxShape.circle,
-    ),
-  );
-
-  static const centerLoading = Padding(
-    padding: EdgeInsets.symmetric(vertical: 7),
-    child: Center(child: CircularProgressIndicator()),
-  );
-
-  static var colorSeed = const Color.fromARGB(255, 72, 15, 15);
-  static var primaryColor = colorSeed;
 }

lib/kit/core/rnode.dart

@@ -5,13 +5,7 @@ import '../core/platform.dart';
 import 'appbar.dart';
 
 abstract final class WindowFrameConfig {
-  static bool _showCaption = true;
-
-  static bool get showCaption => _showCaption && isDesktop;
-
-  static void setShowCaption(bool value) {
-    _showCaption = value;
-  }
+  static bool get showCaption => isDesktop;
 }
 
 class VirtualWindowFrame extends StatelessWidget {