fix(studio): connect to the active channel, not hard-coded :50051

Studio defaulted its endpoint to the local channel's port (:50051), but
a curl|sh user is on the production channel (:50071) — so the sidebar
probed a different daemon than the Diagnose page reported, showing
'connected' next to 'production daemon stopped'. On first run Studio now
reads ~/.chain/current-channel (+ run/<ch>.endpoint) and follows the
active channel; an explicit Settings endpoint still wins and persists,
auto-discovery does not (re-follows the channel each launch). The
connection caption now names the channel ('Connected · production') so
it can never look contradictory again.

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

lib/data/error_presentation.dart

@@ -85,6 +85,30 @@ void showFaiErrorSnack(
   );
 }
 
+/// Surface a failed external-process result (daemon start, binary
+/// probe, file-open) as a copyable error snack. The `ok/stdout/stderr`
+/// record these actions return is not a thrown error, so call sites used
+/// to drop it into a raw `SnackBar(Text(...))` — uncopyable, the exact
+/// thing the operator needs to paste back. This joins stderr + stdout
+/// into one selectable, one-tap-copyable, logged message.
+void showFaiProcessError(
+  BuildContext context,
+  String source,
+  String stdout,
+  String stderr, {
+  String? title,
+}) {
+  final detail = [stderr.trim(), stdout.trim()]
+      .where((s) => s.isNotEmpty)
+      .join('\n\n');
+  showFaiErrorSnack(
+    context,
+    source,
+    detail.isEmpty ? 'process exited non-zero (no output)' : detail,
+    title: title,
+  );
+}
+
 /// Show [error] as a centered modal dialog. Use this when the
 /// failure blocks meaningful interaction (auth missing, hub
 /// unreachable) — a SnackBar would be too easy to dismiss.

lib/data/hub.dart

@@ -5,6 +5,7 @@
 // Methods return UI-friendly types so pages stay free of
 // protobuf imports.
 
+import 'dart:io';
 import 'dart:typed_data';
 
 import 'package:chain_client_sdk/chain_client_sdk.dart';
@@ -28,10 +29,79 @@ class HubService {
 
   HubEndpoint get currentEndpoint => _client.endpoint;
 
+  /// The channel Studio is connected to, discovered from
+  /// `~/.chain/current-channel` when no explicit endpoint was set.
+  /// Shown next to the connection caption so "connected" names which
+  /// daemon — never contradicting the Diagnose page again.
+  String? activeChannel;
+
+  /// Best-effort name of the channel the current endpoint targets,
+  /// matched by its well-known port (50071 → production). Falls back to
+  /// the auto-discovered channel. `null` for a custom host/port.
+  String? get connectedChannelName {
+    final port = _client.endpoint.port;
+    for (final e in _channelPorts.entries) {
+      if (e.value == port) return e.key;
+    }
+    return activeChannel;
+  }
+
   static const _kHostKey = 'hub.host';
   static const _kPortKey = 'hub.port';
   static const _kSecureKey = 'hub.secure';
 
+  /// gRPC default ports per channel (mirror of the Rust
+  /// `Channel::default_port`). Used as the fallback when the daemon
+  /// has not written its `run/<channel>.endpoint` file yet.
+  static const _channelPorts = {
+    'local': 50051,
+    'dev': 50041,
+    'beta': 50061,
+    'production': 50071,
+  };
+
+  /// The endpoint of the channel the operator is actually on, read
+  /// from `~/.chain` (the hub writes `current-channel` and, when a
+  /// daemon is up, `run/<channel>.endpoint`). Lets a fresh Studio
+  /// follow the installed channel — a `curl | sh` user lands on
+  /// `production` (:50071), not the hard-coded local :50051. Returns
+  /// null when it cannot be determined (then we keep the default).
+  static ({String channel, HubEndpoint endpoint})? _discoverActiveChannel() {
+    try {
+      final home = Platform.environment['HOME'] ??
+          Platform.environment['USERPROFILE'];
+      if (home == null || home.isEmpty) return null;
+      final sep = Platform.pathSeparator;
+      final base = '$home$sep.chain';
+      final ccFile = File('$base${sep}current-channel');
+      final channel =
+          ccFile.existsSync() ? ccFile.readAsStringSync().trim() : 'local';
+      if (channel.isEmpty) return null;
+      // Prefer the actual bound endpoint the daemon wrote.
+      final epFile = File('$base${sep}run$sep$channel.endpoint');
+      if (epFile.existsSync()) {
+        final raw =
+            epFile.readAsStringSync().trim().replaceFirst(RegExp(r'^\w+://'), '');
+        final i = raw.lastIndexOf(':');
+        if (i > 0) {
+          final host = raw.substring(0, i);
+          final port = int.tryParse(raw.substring(i + 1));
+          if (port != null) {
+            return (channel: channel, endpoint: HubEndpoint(host: host, port: port));
+          }
+        }
+      }
+      // Fall back to the channel's well-known default port.
+      return (
+        channel: channel,
+        endpoint:
+            HubEndpoint(host: '127.0.0.1', port: _channelPorts[channel] ?? 50051),
+      );
+    } catch (_) {
+      return null;
+    }
+  }
+
   /// Sentinel distinguishing "caller did not pass authToken"
   /// from "caller passed null to drop the token".
   static const Object _unset = Object();
@@ -45,32 +115,59 @@ class HubService {
     final port = prefs.getInt(_kPortKey);
     final secure = prefs.getBool(_kSecureKey);
     final token = await HubAuthToken.read();
-    if (host == null && token == null) return;
-    final endpoint = HubEndpoint(
-      host: host ?? _client.endpoint.host,
-      port: port ?? _client.endpoint.port,
-      secure: secure ?? _client.endpoint.secure,
-    );
-    await reconnect(endpoint, authToken: token);
+
+    // 1) An endpoint the operator explicitly chose in Settings wins.
+    if (host != null) {
+      await reconnect(
+        HubEndpoint(
+          host: host,
+          port: port ?? _client.endpoint.port,
+          secure: secure ?? false,
+        ),
+        authToken: token,
+      );
+      return;
+    }
+
+    // 2) Otherwise follow the active channel from ~/.chain, so Studio
+    //    connects to the daemon the operator installed (e.g. production
+    //    :50071) instead of the hard-coded local :50051. Not persisted,
+    //    so Studio re-discovers each launch and tracks channel switches.
+    final discovered = _discoverActiveChannel();
+    if (discovered != null) {
+      activeChannel = discovered.channel;
+      await reconnect(discovered.endpoint, authToken: token, persist: false);
+      return;
+    }
+
+    // 3) Nothing to discover: keep the default client, apply any token.
+    if (token != null) {
+      await reconnect(_client.endpoint, authToken: token, persist: false);
+    }
   }
 
-  /// Reconnect to a new endpoint and persist for next launch.
-  /// [authToken] is read from `~/.chain/hub-auth-token` by
-  /// default — pass `null` to drop a previously-loaded token,
-  /// or omit the parameter to keep the current value.
+  /// Reconnect to a new endpoint. With [persist] (the default) the
+  /// endpoint is saved for next launch — that is an explicit operator
+  /// choice. Auto-discovery passes `persist: false` so it never
+  /// overwrites a real choice and keeps re-following the active channel.
+  /// [authToken] is read from `~/.chain/hub-auth-token` by default —
+  /// pass `null` to drop a token, or omit to keep the current value.
   Future<void> reconnect(
     HubEndpoint endpoint, {
     Object? authToken = _unset,
+    bool persist = true,
   }) async {
     await _client.close();
     final token = identical(authToken, _unset)
         ? await HubAuthToken.read()
         : authToken as String?;
     _client = HubClient(endpoint: endpoint, authToken: token);
-    final prefs = await SharedPreferences.getInstance();
-    await prefs.setString(_kHostKey, endpoint.host);
-    await prefs.setInt(_kPortKey, endpoint.port);
-    await prefs.setBool(_kSecureKey, endpoint.secure);
+    if (persist) {
+      final prefs = await SharedPreferences.getInstance();
+      await prefs.setString(_kHostKey, endpoint.host);
+      await prefs.setInt(_kPortKey, endpoint.port);
+      await prefs.setBool(_kSecureKey, endpoint.secure);
+    }
   }
 
   /// Reload the token from disk and reconnect using the current
@@ -902,7 +999,18 @@ class HubService {
           .catchError((_) => <PendingApprovalEntry>[]),
       _client.verifyEventChain().catchError((_) => VerifyEventChainResponse()),
       _client.listServices().catchError((_) => <DeclaredService>[]),
-      _client.checkUpdate().catchError((_) => CheckUpdateResponse()),
+      // checkUpdate does a live manifest fetch (server-side 8s timeout).
+      // The other five are local-socket RPCs that return in ms, so cap
+      // this one tightly — otherwise it alone gates the whole Diagnose
+      // page open. A timeout reads as "release host unreachable", which
+      // the UI already renders as an offline banner, not an error.
+      _client
+          .checkUpdate()
+          .timeout(
+            const Duration(seconds: 2),
+            onTimeout: () => CheckUpdateResponse(),
+          )
+          .catchError((_) => CheckUpdateResponse()),
       _client.daemonPaths().catchError((_) => DaemonPathsResponse()),
     ]);
 

lib/main.dart

@@ -9,6 +9,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 
 import 'data/chain_log.dart';
+import 'data/error_presentation.dart';
 import 'data/hub.dart';
 import 'data/system_actions.dart';
 import 'data/theme_plugin.dart';
@@ -270,14 +271,21 @@ class StudioShellState extends State<StudioShell> {
     final l = AppLocalizations.of(context)!;
     final r = await SystemActions.chainDaemon(['start']);
     if (!mounted) return;
-    final detail = r.stderr.trim().isEmpty ? r.stdout.trim() : r.stderr.trim();
-    ScaffoldMessenger.of(context).showSnackBar(
-      SnackBar(
-        content: Text(
-          r.ok ? l.daemonStartRequested : l.daemonStartFailed(detail),
-        ),
-      ),
-    );
+    if (r.ok) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(content: Text(l.daemonStartRequested)),
+      );
+    } else {
+      // Surface the daemon's stderr/stdout as a copyable error — this
+      // is the message the operator most often needs to paste back.
+      showFaiProcessError(
+        context,
+        'daemon.start',
+        r.stdout,
+        r.stderr,
+        title: l.daemonStartFailed(''),
+      );
+    }
     // Probe again shortly so the UI flips to "connected" without
     // waiting for the next 5 s tick.
     Future.delayed(const Duration(seconds: 1), _checkHealth);
@@ -690,14 +698,21 @@ class _SidebarState extends State<_Sidebar>
     final l = AppLocalizations.of(context)!;
     final r = await SystemActions.chainDaemon(['start']);
     if (!context.mounted) return;
-    final detail = r.stderr.trim().isEmpty ? r.stdout.trim() : r.stderr.trim();
-    ScaffoldMessenger.of(context).showSnackBar(
-      SnackBar(
-        content: Text(
-          r.ok ? l.daemonStartRequested : l.daemonStartFailed(detail),
-        ),
-      ),
-    );
+    if (r.ok) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(content: Text(l.daemonStartRequested)),
+      );
+    } else {
+      // Surface the daemon's stderr/stdout as a copyable error — this
+      // is the message the operator most often needs to paste back.
+      showFaiProcessError(
+        context,
+        'daemon.start',
+        r.stdout,
+        r.stderr,
+        title: l.daemonStartFailed(''),
+      );
+    }
   }
 
   @override
@@ -748,8 +763,11 @@ class _SidebarState extends State<_Sidebar>
                   Builder(
                     builder: (context) {
                       final l = AppLocalizations.of(context)!;
+                      final ch = HubService.instance.connectedChannelName;
                       final caption = widget.connected == true
-                          ? l.connectionConnected
+                          ? (ch != null
+                                ? '${l.connectionConnected} · $ch'
+                                : l.connectionConnected)
                           : widget.connected == false
                           ? l.connectionTapToStart
                           : l.connectionConnecting;
@@ -909,7 +927,8 @@ class _ChannelPill extends StatelessWidget {
   Color _accent(ColorScheme cs) {
     switch (channel) {
       case 'production':
-        return cs.error;
+        // "Live & healthy", not an error — red here read as a fault.
+        return ChainColors.success;
       case 'beta':
         return ChainColors.warning;
       case 'dev':
@@ -1023,7 +1042,8 @@ class _CollapsedChannelChip extends StatelessWidget {
   Color _accent(ColorScheme cs) {
     switch (channel) {
       case 'production':
-        return cs.error;
+        // "Live & healthy", not an error — red here read as a fault.
+        return ChainColors.success;
       case 'beta':
         return ChainColors.warning;
       case 'dev':
@@ -1110,8 +1130,12 @@ class _ConnectionLabel extends StatelessWidget {
     final captionColor = connected == false
         ? theme.colorScheme.error
         : theme.colorScheme.onSurface;
+    // Name the channel the connection is on (production / local / …) so
+    // "connected" can never look like it contradicts the Diagnose page,
+    // which reports the *active* channel's daemon.
+    final ch = HubService.instance.connectedChannelName;
     final caption = connected == true
-        ? l.connectionConnected
+        ? (ch != null ? '${l.connectionConnected} · $ch' : l.connectionConnected)
         : connected == false
         ? l.connectionTapToStart
         : l.connectionConnecting;

lib/pages/federation.dart

@@ -5,6 +5,7 @@ import '../data/hub.dart';
 import '../l10n/app_localizations.dart';
 import '../theme/theme.dart';
 import '../theme/tokens.dart';
+import '../data/error_presentation.dart';
 import '../widgets/widgets.dart';
 import 'welcome.dart' show showFaiDoc;
 
@@ -48,9 +49,8 @@ class _FederationPageState extends State<FederationPage> {
       _refresh();
     } catch (e) {
       if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(l.federationIssueFailed(e.toString()))),
-      );
+      showFaiErrorSnack(context, 'federation.issue', e,
+          title: l.federationIssueFailed(''));
     }
   }
 
@@ -131,15 +131,13 @@ class _FederationPageState extends State<FederationPage> {
           }
           final sats = snapshot.data ?? [];
           if (sats.isEmpty) {
+            // The "add satellite" action lives in the FAB (always
+            // visible); don't repeat it here — that showed the button
+            // twice on the empty page.
             return ChainEmptyState(
               icon: Icons.hub_outlined,
               title: l.federationEmptyTitle,
               hint: l.federationEmptyHint,
-              action: FilledButton.icon(
-                onPressed: _addSatellite,
-                icon: const Icon(Icons.add_link, size: 16),
-                label: Text(l.federationAddSatellite),
-              ),
             );
           }
           return ListView.separated(

lib/pages/flows.dart

@@ -13,6 +13,7 @@
 import 'package:chain_studio_flow_editor/chain_studio_flow_editor.dart';
 import 'package:flutter/material.dart';
 
+import '../data/error_presentation.dart';
 import '../data/flow_run_driver.dart';
 import '../data/hub.dart';
 import '../l10n/app_localizations.dart';
@@ -94,7 +95,13 @@ class _FlowsPageState extends State<FlowsPage> {
   /// list so the editor can re-analyze without waiting for the
   /// parent widget rebuild.
   Future<List<String>?> _onInstallCapability(String capability) async {
-    return _runInstall(source: capability);
+    // The analyzer hands us the full `use:` value (e.g. `debug.echo@^0`).
+    // The hub resolves install sources by bare capability name; the
+    // `@<constraint>` suffix would make the store lookup miss ("no store
+    // entry for 'debug.echo@^0'"). Strip it — same as the Store page.
+    final at = capability.indexOf('@');
+    final bare = at < 0 ? capability : capability.substring(0, at);
+    return _runInstall(source: bare);
   }
 
   /// `Add source for <cap>…` handler. Prompts the operator
@@ -123,15 +130,13 @@ class _FlowsPageState extends State<FlowsPage> {
     } catch (e) {
       if (mounted) {
         final l = AppLocalizations.of(context);
-        final msg = l != null
-            ? l.installFailed(e.toString())
-            : 'Install failed: $e';
-        ScaffoldMessenger.of(context).removeCurrentSnackBar();
-        ScaffoldMessenger.of(context).showSnackBar(
-          SnackBar(
-            content: Text(msg),
-            behavior: SnackBarBehavior.floating,
-          ),
+        // Copyable error (was a plain SnackBar) — install failures
+        // carry the real cause (network, signature, store lookup).
+        showFaiErrorSnack(
+          context,
+          'flows.install',
+          e,
+          title: l != null ? l.installFailed('') : 'Install failed',
         );
       }
       return null;

linux/runner/my_application.cc

@@ -45,11 +45,11 @@ static void my_application_activate(GApplication* application) {
   if (use_header_bar) {
     GtkHeaderBar* header_bar = GTK_HEADER_BAR(gtk_header_bar_new());
     gtk_widget_show(GTK_WIDGET(header_bar));
-    gtk_header_bar_set_title(header_bar, "F\u2206I Studio");
+    gtk_header_bar_set_title(header_bar, "Ch\u2206In Studio");
     gtk_header_bar_set_show_close_button(header_bar, TRUE);
     gtk_window_set_titlebar(window, GTK_WIDGET(header_bar));
   } else {
-    gtk_window_set_title(window, "F\u2206I Studio");
+    gtk_window_set_title(window, "Ch\u2206In Studio");
   }
 
   gtk_window_set_default_size(window, 1280, 900);

macos/Runner/Info.plist

@@ -13,9 +13,9 @@
 	<key>CFBundleInfoDictionaryVersion</key>
 	<string>6.0</string>
 	<key>CFBundleName</key>
-	<string>F∆I Studio</string>
+	<string>Ch∆In Studio</string>
 	<key>CFBundleDisplayName</key>
-	<string>F∆I Studio</string>
+	<string>Ch∆In Studio</string>
 	<key>CFBundlePackageType</key>
 	<string>APPL</string>
 	<key>CFBundleShortVersionString</key>

macos/Runner/MainFlutterWindow.swift

@@ -7,9 +7,9 @@ class MainFlutterWindow: NSWindow {
     self.contentViewController = flutterViewController
 
     // Override the window title so the OS task switcher and
-    // window chrome read "F∆I Studio" instead of the
+    // window chrome read "Ch∆In Studio" instead of the
     // pubspec-derived "chain_studio".
-    self.title = "F∆I Studio"
+    self.title = "Ch∆In Studio"
 
     // Pick a comfortable default window size. 1440x900 is the
     // effective Retina resolution of a 13" MacBook (Stefan's