feat(studio): localise Settings sidebar + add inline help docs + Approvals doc

Three operator-UX gaps closed:

  - Settings dialog's six-category sidebar (General / Appearance /
    System AI / Integrations / Security / Maintenance) was
    hardcoded English; now flows through AppLocalizations
    ("Allgemein" / "Darstellung" / "System-KI" / "Integrationen" /
    "Sicherheit" / "Wartung"). Same for the per-panel title +
    description.
  - Per-channel daemon-action labels ('enable autostart' /
    'disable autostart' / 'daemon restart' etc.) and the
    OK / Failed result line in the toast also moved to l10n,
    so the system-action feedback reads as one language.
  - New 'Approvals' doc bundle (en + de) under assets/docs/,
    registered as a fifth doc card on Welcome plus exposed via
    the new public  helper. The
    Approvals, Audit and Doctor app-bars grow a Help icon button
    next to Refresh that opens the matching doc in the existing
    bottom-sheet reader — no extra screen, no learning curve.

Studio bumped to 0.67.0; editor path-override pulls in 0.20.1
(flow-list row polish).

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

lib/widgets/fai_settings_dialog.dart

@@ -311,11 +311,12 @@ class _FaiSettingsDialogState extends State<FaiSettingsDialog> {
     });
     final r = await action();
     if (!mounted) return;
+    final l = AppLocalizations.of(context)!;
     setState(() {
       _saving = false;
       _channelToast = r.ok
-          ? 'OK · $label\n${r.stdout.trim()}'
-          : 'Failed · $label\n${(r.stderr.isEmpty ? r.stdout : r.stderr).trim()}';
+          ? '${l.daemonActionResultOk(label)}\n${r.stdout.trim()}'
+          : '${l.daemonActionResultFailed(label)}\n${(r.stderr.isEmpty ? r.stdout : r.stderr).trim()}';
     });
   }
 
@@ -528,13 +529,13 @@ class _FaiSettingsDialogState extends State<FaiSettingsDialog> {
             onEnableAutostart: _saving
                 ? null
                 : () => _runDaemon(
-                    'enable autostart',
+                    l.daemonActionEnableAutostart,
                     () => SystemActions.faiDaemonEnable(ch.name),
                   ),
             onDisableAutostart: _saving
                 ? null
                 : () => _runDaemon(
-                    'disable autostart',
+                    l.daemonActionDisableAutostart,
                     () => SystemActions.faiDaemonDisable(ch.name),
                   ),
           ),
@@ -562,10 +563,8 @@ class _FaiSettingsDialogState extends State<FaiSettingsDialog> {
   List<Widget> _aiPanel(AppLocalizations l, ThemeData theme) {
     return [
       _panelTitle(
-        'System AI',
-        'Operator-managed LLM endpoint used by Studio for the AI '
-            'helpers (system-ai-edit, install-suggest, doctor-summary). '
-            'No flow ever calls this; modules speak to their own LLM.',
+        l.settingsAiPanelTitle,
+        l.settingsAiPanelBody,
         theme,
       ),
       if (_aiStatus == null)
@@ -586,10 +585,8 @@ class _FaiSettingsDialogState extends State<FaiSettingsDialog> {
   List<Widget> _integrationsPanel(AppLocalizations l, ThemeData theme) {
     return [
       _panelTitle(
-        'Integrations',
-        'External tool servers the hub federates capabilities from. '
-            'MCP servers expose tool-shaped endpoints; n8n endpoints '
-            'expose hosted workflows.',
+        l.settingsIntegrationsPanelTitle,
+        l.settingsIntegrationsPanelBody,
         theme,
       ),
       if (_mcpClients == null)
@@ -618,9 +615,8 @@ class _FaiSettingsDialogState extends State<FaiSettingsDialog> {
   List<Widget> _securityPanel(AppLocalizations l, ThemeData theme) {
     return [
       _panelTitle(
-        'Security & credentials',
-        'Tokens the hub holds on the operator\'s behalf. Stored in '
-            '~/.fai/ with mode 0600; never sent in telemetry.',
+        l.settingsSecurityPanelTitle,
+        l.settingsSecurityPanelBody,
         theme,
       ),
       _RegistryCredentialsPanel(
@@ -640,9 +636,8 @@ class _FaiSettingsDialogState extends State<FaiSettingsDialog> {
   List<Widget> _maintenancePanel(AppLocalizations l, ThemeData theme) {
     return [
       _panelTitle(
-        'Maintenance',
-        'Destructive operations gated behind explicit confirm '
-            'dialogs. Use when re-pilot-testing or debugging.',
+        l.settingsMaintenancePanelTitle,
+        l.settingsMaintenancePanelBody,
         theme,
       ),
       _MaintenancePanel(
@@ -2525,19 +2520,19 @@ class _ScopeRow extends StatelessWidget {
           ),
           IconButton(
             icon: const Icon(Icons.arrow_upward, size: 16),
-            tooltip: 'Move up',
+            tooltip: AppLocalizations.of(context)!.tooltipMoveUp,
             onPressed: busy || index == 0 ? null : onUp,
             visualDensity: VisualDensity.compact,
           ),
           IconButton(
             icon: const Icon(Icons.arrow_downward, size: 16),
-            tooltip: 'Move down',
+            tooltip: AppLocalizations.of(context)!.tooltipMoveDown,
             onPressed: busy || index == total - 1 ? null : onDown,
             visualDensity: VisualDensity.compact,
           ),
           IconButton(
             icon: const Icon(Icons.delete_outline, size: 16),
-            tooltip: 'Remove',
+            tooltip: AppLocalizations.of(context)!.tooltipRemove,
             onPressed: busy ? null : onRemove,
             visualDensity: VisualDensity.compact,
           ),
@@ -2559,13 +2554,26 @@ class _Sidebar extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final theme = Theme.of(context);
+    final l = AppLocalizations.of(context)!;
     final items = <(_Category, IconData, String)>[
-      (_Category.general, Icons.tune, 'General'),
-      (_Category.appearance, Icons.palette_outlined, 'Appearance'),
-      (_Category.ai, Icons.psychology_outlined, 'System AI'),
-      (_Category.integrations, Icons.hub_outlined, 'Integrations'),
-      (_Category.security, Icons.shield_outlined, 'Security'),
-      (_Category.maintenance, Icons.build_outlined, 'Maintenance'),
+      (_Category.general, Icons.tune, l.settingsCategoryGeneral),
+      (
+        _Category.appearance,
+        Icons.palette_outlined,
+        l.settingsCategoryAppearance,
+      ),
+      (_Category.ai, Icons.psychology_outlined, l.settingsCategoryAi),
+      (
+        _Category.integrations,
+        Icons.hub_outlined,
+        l.settingsCategoryIntegrations,
+      ),
+      (_Category.security, Icons.shield_outlined, l.settingsCategorySecurity),
+      (
+        _Category.maintenance,
+        Icons.build_outlined,
+        l.settingsCategoryMaintenance,
+      ),
     ];
     return SizedBox(
       width: 220,