fix(studio): live-search exception, daemon-card width, featured tile size; add Start-hub button (v0.20.1)

Three reported bugs and one onramp gap:

- Store live-search threw `setState() callback returned a
  Future`. The `=>` body of `_runSearch` evaluated to the
  Future returned by `_load()`. Switched to a block body so
  the closure resolves to void; the future itself is still
  awaited by the FutureBuilder.

- Doctor's Daemon-control card was visibly narrower than its
  siblings — its only stretching child was a Wrap of small
  buttons. Wrapped the content in `SizedBox(width: infinity)`
  so the card fills the section's width like every other
  panel. Card now leads with the live `running on local:
  127.0.0.1:50051` status row + status pill so operators see
  state at a glance, then offers Restart / Start (when
  stopped) / Stop / Status.

- Featured tiles were 320×152 against the regular grid's
  ~360×168, so the editorial picks looked subordinate to
  the dense grid. Bumped to 480×220 with bigger icon, larger
  title, larger tagline so the strip reads as a hero band.

- ConnectionPill in the sidebar now offers an inline "Start
  hub" button when the daemon is unreachable. Spawns
  `fai daemon start` via SystemActions; the shell-level
  health poll picks the daemon up on its next tick. Closes
  the chicken-and-egg for Windows users who can't open a
  shell to bootstrap.

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

lib/main.dart

@@ -10,6 +10,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 
 import 'data/hub.dart';
+import 'data/system_actions.dart';
 import 'pages/approvals.dart';
 import 'pages/audit.dart';
 import 'pages/doctor.dart';
@@ -23,7 +24,7 @@ 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 = '0.20.0';
+const String kStudioVersion = '0.20.1';
 
 Future<void> main() async {
   WidgetsFlutterBinding.ensureInitialized();
@@ -338,6 +339,19 @@ class _Sidebar extends StatelessWidget {
             child: _ConnectionPill(
               connected: connected,
               label: endpointLabel,
+              onStartRequested: () async {
+                final r = await SystemActions.faiDaemon(['start']);
+                if (!context.mounted) return;
+                ScaffoldMessenger.of(context).showSnackBar(
+                  SnackBar(
+                    content: Text(
+                      r.ok
+                          ? 'Daemon start requested. Reconnecting…'
+                          : 'Could not start daemon: ${r.stderr.trim().isEmpty ? r.stdout.trim() : r.stderr.trim()}',
+                    ),
+                  ),
+                );
+              },
             ),
           ),
           if (activeChannel != null && activeChannel!.isNotEmpty) ...[
@@ -482,8 +496,17 @@ class _ChannelPill extends StatelessWidget {
 class _ConnectionPill extends StatelessWidget {
   final bool? connected;
   final String label;
+  /// Triggered by the inline "Start hub" button when the
+  /// daemon is unreachable. Runs `fai daemon start` server-side
+  /// (well, locally — Studio shells out). The shell-level
+  /// health poll picks the daemon up on its next tick.
+  final Future<void> Function() onStartRequested;
 
-  const _ConnectionPill({required this.connected, required this.label});
+  const _ConnectionPill({
+    required this.connected,
+    required this.label,
+    required this.onStartRequested,
+  });
 
   @override
   Widget build(BuildContext context) {
@@ -536,6 +559,31 @@ class _ConnectionPill extends StatelessWidget {
               color: theme.colorScheme.onSurfaceVariant,
             ),
           ),
+          // Inline "Start hub" affordance when the daemon
+          // isn't there. Resolves the chicken-and-egg for
+          // Windows operators who can't run `fai daemon start`
+          // from a shell.
+          if (connected == false) ...[
+            const SizedBox(height: FaiSpace.sm),
+            SizedBox(
+              width: double.infinity,
+              child: FilledButton.tonalIcon(
+                onPressed: onStartRequested,
+                icon: const Icon(Icons.play_arrow, size: 14),
+                label: const Text(
+                  'Start hub',
+                  style: TextStyle(fontSize: 11),
+                ),
+                style: FilledButton.styleFrom(
+                  visualDensity: VisualDensity.compact,
+                  padding: const EdgeInsets.symmetric(
+                    horizontal: FaiSpace.sm,
+                    vertical: 4,
+                  ),
+                ),
+              ),
+            ),
+          ],
         ],
       ),
     );