feat(studio): pending-approvals sidebar badge + per-category settings help

Two operator-attention improvements:

  - The sidebar's Approvals item gains a small accent-coloured
    badge (e.g. '2', '9+') when there are pending approvals,
    polled on the same 5 s tick the health check uses. Operators
    no longer need to open the Approvals page to discover new
    pending decisions; the badge surfaces them at the rail
    level.

  - The Settings dialog's per-category panel titles grow an
    optional help icon (?) that opens the matching bundled
    docs explainer via showFaiDoc. Wired for General →
    architecture, Security → security, Maintenance → audit.
    Other categories deliberately stay un-iced for now —
    Appearance / System AI / Integrations don't yet have a
    standalone bundled doc, and showing a broken help icon
    would be worse than showing none.

Studio bumped to 0.69.0.

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

lib/widgets/fai_settings_dialog.dart

@@ -11,6 +11,7 @@ import '../data/hub_auth_token.dart';
 import '../data/registry_token.dart';
 import '../data/system_actions.dart';
 import '../l10n/app_localizations.dart';
+import '../pages/welcome.dart' show showFaiDoc;
 import '../theme/theme.dart';
 import '../theme/tokens.dart';
 import 'fai_error_box.dart';
@@ -394,17 +395,35 @@ class _FaiSettingsDialogState extends State<FaiSettingsDialog> {
     );
   }
 
-  Widget _panelTitle(String title, String subtitle, ThemeData theme) {
+  Widget _panelTitle(
+    String title,
+    String subtitle,
+    ThemeData theme, {
+    String? docSlug,
+  }) {
     return Padding(
       padding: const EdgeInsets.only(bottom: FaiSpace.lg),
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
-          Text(
-            title,
-            style: theme.textTheme.titleLarge?.copyWith(
-              fontWeight: FontWeight.w700,
-            ),
+          Row(
+            children: [
+              Expanded(
+                child: Text(
+                  title,
+                  style: theme.textTheme.titleLarge?.copyWith(
+                    fontWeight: FontWeight.w700,
+                  ),
+                ),
+              ),
+              if (docSlug != null)
+                IconButton(
+                  icon: const Icon(Icons.help_outline, size: 18),
+                  tooltip: AppLocalizations.of(context)!.helpTooltip,
+                  onPressed: () => showFaiDoc(context, docSlug),
+                  visualDensity: VisualDensity.compact,
+                ),
+            ],
           ),
           const SizedBox(height: 4),
           Text(
@@ -424,6 +443,7 @@ class _FaiSettingsDialogState extends State<FaiSettingsDialog> {
         l.settingsTitle,
         l.settingsHubEndpointHint,
         theme,
+        docSlug: 'architecture',
       ),
       TextField(
         controller: _host,
@@ -618,6 +638,7 @@ class _FaiSettingsDialogState extends State<FaiSettingsDialog> {
         l.settingsSecurityPanelTitle,
         l.settingsSecurityPanelBody,
         theme,
+        docSlug: 'security',
       ),
       _RegistryCredentialsPanel(
         configuredChars: _registryTokenChars,
@@ -639,6 +660,7 @@ class _FaiSettingsDialogState extends State<FaiSettingsDialog> {
         l.settingsMaintenancePanelTitle,
         l.settingsMaintenancePanelBody,
         theme,
+        docSlug: 'audit',
       ),
       _MaintenancePanel(
         onResetDone: () async {