fix(studio): sidebar — fix icon-shift + use collapsed top space

Two UX bugs Stefan flagged on the v0.51.0 collapsible rail:

1. Icons re-positioned when the rail expanded. Operators
   already pointing at an icon had to chase it as the rail
   grew. Two causes: the _SidebarItem switched between
   `Center(icon)` (collapsed) and `Row(icon, gap, label)`
   (expanded), and the AnimatedContainer's horizontal padding
   switched between FaiSpace.sm (collapsed) and FaiSpace.md
   (expanded). Both flipped the icon's effective X-position.

   Now: same Row, same AnimatedContainer padding, in both
   states. The icon sits at the same X-pixel always; only
   the label slot toggles open beside it.

2. Top of the collapsed rail was wasted (only the brand-mark
   was visible; version + connection + channel disappeared
   completely). Use the same vertical real estate for
   glance-able compact equivalents:

   * tiny "v0.51" version text in mono below the brand
   * _CollapsedConnectionDot — 10 px circle, green/red/amber
     tonality matching FaiDeltaMark's mode states. Tooltip
     surfaces the full endpoint string.
   * _CollapsedChannelChip — 18 px circle with the channel's
     first letter (P / B / D / L) in the same accent tone
     the full pill uses, so "production" stays unmistakably
     red even at-a-glance.

When the rail expands, the full pills replace the compact
indicators as before. Tests still green (the existing widget
test booted without hover-expand and that path stays correct
either way).

Version: 0.51.0 → 0.51.1
Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

lib/main.dart

@@ -27,7 +27,7 @@ import 'widgets/widgets.dart';
 /// Studio's own build version. Bump on every UI commit so the
 /// running app self-identifies — visible in the sidebar header
 /// and quick-glance proof that you're seeing the current build.
-const String kStudioVersion = '0.51.0';
+const String kStudioVersion = '0.51.1';
 
 Future<void> main() async {
   WidgetsFlutterBinding.ensureInitialized();
@@ -499,9 +499,7 @@ class _SidebarState extends State<_Sidebar> {
                   ),
                 ),
                 const SizedBox(height: FaiSpace.md),
-                // Connection pill — only when expanded; the
+                // Connection pill — full version when expanded.
-                // status-dot is encoded in the delta-mark's mode
-                // so collapsed users still see at-a-glance state.
                 Padding(
                   padding: const EdgeInsets.symmetric(horizontal: FaiSpace.lg),
                   child: _ConnectionPill(
@@ -529,6 +527,36 @@ class _SidebarState extends State<_Sidebar> {
                     child: _ChannelPill(channel: widget.activeChannel!),
                   ),
                 ],
+              ] else ...[
+                // Collapsed top: keep the brand mark and the
+                // most glance-able status indicators (version,
+                // connection dot, channel letter) so the rail
+                // still reads as F∆I Studio at-a-glance without
+                // hovering to expand.
+                const SizedBox(height: FaiSpace.sm),
+                Text(
+                  'v$kStudioVersion'.replaceFirst(RegExp(r'-.*'), ''),
+                  style: FaiTheme.mono(
+                    size: 9,
+                    color: theme.colorScheme.primary,
+                  ),
+                ),
+                const SizedBox(height: FaiSpace.md),
+                Tooltip(
+                  message: widget.connected == true
+                      ? 'Connected · ${widget.endpointLabel}'
+                      : widget.connected == false
+                          ? 'Disconnected · ${widget.endpointLabel}'
+                          : 'Connecting · ${widget.endpointLabel}',
+                  child: _CollapsedConnectionDot(connected: widget.connected),
+                ),
+                if (widget.activeChannel != null && widget.activeChannel!.isNotEmpty) ...[
+                  const SizedBox(height: FaiSpace.sm),
+                  Tooltip(
+                    message: widget.activeChannel!,
+                    child: _CollapsedChannelChip(channel: widget.activeChannel!),
+                  ),
+                ],
               ],
               const SizedBox(height: FaiSpace.xxl),
               // Destinations.
@@ -671,6 +699,91 @@ class _ChannelPill extends StatelessWidget {
   }
 }
 
+/// Mini-version of [_ConnectionPill] used when the sidebar is
+/// collapsed. A 10px dot in the same green/red/amber tonality
+/// the FaiDeltaMark uses for live / idle / unknown.
+class _CollapsedConnectionDot extends StatelessWidget {
+  final bool? connected;
+  const _CollapsedConnectionDot({required this.connected});
+
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+    final color = connected == true
+        ? FaiColors.success
+        : connected == false
+            ? theme.colorScheme.error
+            : FaiColors.warning;
+    return Container(
+      width: 10,
+      height: 10,
+      decoration: BoxDecoration(
+        color: color,
+        shape: BoxShape.circle,
+        boxShadow: [
+          BoxShadow(
+            color: color.withValues(alpha: 0.35),
+            blurRadius: 4,
+            spreadRadius: 0.5,
+          ),
+        ],
+      ),
+    );
+  }
+}
+
+/// Mini-version of [_ChannelPill] used when the sidebar is
+/// collapsed. A 16px circular chip with the first letter of
+/// the channel (P / B / D / L) in the same accent tone the
+/// full pill uses, so production stays unmistakeable at a
+/// glance.
+class _CollapsedChannelChip extends StatelessWidget {
+  final String channel;
+  const _CollapsedChannelChip({required this.channel});
+
+  Color _accent(ColorScheme cs) {
+    switch (channel) {
+      case 'production':
+        return cs.error;
+      case 'beta':
+        return FaiColors.warning;
+      case 'dev':
+        return cs.primary;
+      case 'local':
+      default:
+        return cs.onSurfaceVariant;
+    }
+  }
+
+  String get _letter {
+    if (channel.isEmpty) return '·';
+    return channel.substring(0, 1).toUpperCase();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+    final accent = _accent(theme.colorScheme);
+    return Container(
+      width: 18,
+      height: 18,
+      decoration: BoxDecoration(
+        shape: BoxShape.circle,
+        border: Border.all(color: accent.withValues(alpha: 0.55)),
+      ),
+      alignment: Alignment.center,
+      child: Text(
+        _letter,
+        style: FaiTheme.mono(
+          size: 10,
+          weight: FontWeight.w700,
+          color: accent,
+        ),
+      ),
+    );
+  }
+}
+
 class _ConnectionPill extends StatelessWidget {
   final bool? connected;
   final String label;
@@ -808,25 +921,28 @@ class _SidebarItemState extends State<_SidebarItem> {
       size: 18,
       color: color,
     );
-    final Widget content = widget.expanded
+    // Same Row + same outer padding in both states so the icon
-        ? Row(
+    // stays at the exact same X-pixel before and after expand
-            mainAxisSize: MainAxisSize.min,
+    // (operators don't have to re-aim at a destination they
-            children: [
+    // already pointed at). The label slot is conditional, the
-              icon,
+    // icon's position is not.
-              const SizedBox(width: FaiSpace.md),
+    final content = Row(
-              // Flexible so the label can ellipsize during the
+      mainAxisSize: MainAxisSize.min,
-              // collapse animation instead of overflowing.
+      children: [
-              Flexible(
+        icon,
-                child: Text(
+        if (widget.expanded) ...[
-                  label,
+          const SizedBox(width: FaiSpace.md),
-                  overflow: TextOverflow.fade,
+          Flexible(
-                  softWrap: false,
+            child: Text(
-                  style: theme.textTheme.labelMedium?.copyWith(color: color),
+              label,
-                ),
+              overflow: TextOverflow.fade,
-              ),
+              softWrap: false,
-            ],
+              style: theme.textTheme.labelMedium?.copyWith(color: color),
-          )
+            ),
-        : Center(child: icon);
+          ),
+        ],
+      ],
+    );
 
     final inner = Padding(
       padding: const EdgeInsets.symmetric(vertical: 2),
@@ -839,8 +955,8 @@ class _SidebarItemState extends State<_SidebarItem> {
           onTap: widget.onTap,
           child: AnimatedContainer(
             duration: FaiMotion.fast,
-            padding: EdgeInsets.symmetric(
+            padding: const EdgeInsets.symmetric(
-              horizontal: widget.expanded ? FaiSpace.md : FaiSpace.sm,
+              horizontal: FaiSpace.md,
               vertical: FaiSpace.md,
             ),
             decoration: BoxDecoration(

pubspec.yaml

@@ -1,7 +1,7 @@
 name: fai_studio
 description: "F∆I Studio — desktop GUI for the F∆I hub"
 publish_to: 'none'
-version: 0.51.0
+version: 0.51.1
 
 environment:
   sdk: ^3.11.0-200.1.beta