fix(client): 自动连接死锁兜底(轮询)+ 逐次门控日志(1.0.27)

复现:armed→设置已加载后无 ready。死锁:selLoaded 靠 selectedNode controller 的 loaded 标志,
而该标志完成时若选中值未变(==默认)不会发通知,若 nodeSub 已先于它触发则此后无人再调 tryGo。
修:_maybeAutoConnect 加 Timer.periodic(400ms,≤12s)兜底复查,decided 后停;并恢复每次 tryGo
打 check 日志(settingsLoaded/selLoaded/node uuid)以确认卡点。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

client/lib/main.dart

@@ -1,5 +1,6 @@
 // main.dart — 入口(演示态)
 // 串接:登录 → 引导 → 主框架(4 Tab);状态层统一走 Riverpod。
+import 'dart:async';
 import 'dart:io';
 import 'dart:ui' as ui;
 
@@ -133,7 +134,14 @@ class _RootFlowState extends ConsumerState<RootFlow> {
     ProviderSubscription<AsyncValue<List<Node>>>? nodeSub;
     ProviderSubscription<AppSettings>? settingsSub;
     ProviderSubscription<String>? selSub;
+    Timer? poll;
     var decided = false;
+    void finish() {
+      nodeSub?.close();
+      settingsSub?.close();
+      selSub?.close();
+      poll?.cancel();
+    }
     void tryGo() {
       if (decided) return;
       final settings = ref.read(settingsProvider);
@@ -142,11 +150,11 @@ class _RootFlowState extends ConsumerState<RootFlow> {
       // 否则可能在 effectiveNode 尚是占位/未就绪时就触发,_connect 报「节点尚未就绪」。
       // 还要等设置 + 选中节点都从持久化恢复完,否则可能用到未恢复的默认(智能)而非上次选择。
       final node = ref.read(effectiveNodeProvider);
+      logLine('AutoConnect',
+          'check: settingsLoaded=${settings.loaded} selLoaded=$selLoaded node=${node.code} uuid=${node.uuid.isEmpty ? "EMPTY" : "ok"}');
       if (!settings.loaded || !selLoaded || node.uuid.isEmpty) return;
       decided = true;
-      nodeSub?.close();
-      settingsSub?.close();
-      selSub?.close();
+      finish();
       final phase = ref.read(connectionProvider).phase;
       logLine('AutoConnect', 'ready: autoConnect=${settings.autoConnect} phase=$phase node=${node.code} uuid=${node.uuid.isEmpty ? "EMPTY" : "ok"}');
       if (settings.autoConnect && phase == VpnPhase.off) {
@@ -163,6 +171,15 @@ class _RootFlowState extends ConsumerState<RootFlow> {
     nodeSub = ref.listenManual(nodesProvider, (_, __) => tryGo());
     settingsSub = ref.listenManual(settingsProvider, (_, __) => tryGo());
     selSub = ref.listenManual(selectedNodeCodeProvider, (_, __) => tryGo());
+    // 兜底轮询:有些就绪信号(如选中节点 _load 完成但值未变,不会发通知)不会触发上面的监听,
+    // 靠定时复查避免「明明都就绪了却没人再调 tryGo」的死锁。最多等 ~12s。
+    poll = Timer.periodic(const Duration(milliseconds: 400), (t) {
+      if (decided || t.tick > 30) {
+        t.cancel();
+        return;
+      }
+      tryGo();
+    });
     tryGo();
   }