feat(studio): brand-agnostic onboarding hints + clickable checklist + theme-picker clarity

Three changes:

1. Onboarding checklist hints no longer mention DeepWiki,
   Semgrep, text.extract, or extract-summarize.yaml by
   name. Brand- and file-specific copy moved to neutral
   feature pointers ('add an MCP source', 'install a
   module'). Brand names belong on the welcome page only
   if they're load-bearing for understanding, which they
   aren't.

2. Checklist rows are now clickable. Tapping a row navigates
   to the page where the operator can complete it — MCP +
   AI open Settings, Module opens Store, Flow opens Flows.
   StudioShellState gains a public navigateTo(pageId) helper
   so descendants can drive sidebar selection without
   plumbing a controller through props.

3. Theme picker hint copy rewritten. Old hint suggested
   'Custom' was a single-colour tweak; new copy spells out
   that Material 3 derives a full palette (primary,
   secondary, tertiary, surface, …) from one seed colour.
   The Custom tile shows a small tune icon so its
   open-the-picker semantics is visually distinct from the
   apply-immediately plugin tiles.

Editor bumped to 0.12.0 (panel toggle + LabVIEW-style port
colours).

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

lib/pages/welcome.dart

@@ -16,6 +16,7 @@ import 'package:shared_preferences/shared_preferences.dart';
 import '../data/hub.dart';
 import '../data/system_actions.dart';
 import '../l10n/app_localizations.dart';
+import '../main.dart' show StudioShellState;
 import '../theme/theme.dart';
 import '../theme/tokens.dart';
 import '../widgets/widgets.dart';
@@ -472,11 +473,36 @@ class _OnboardingChecklistState extends State<_OnboardingChecklist> {
     final theme = Theme.of(context);
     final l = AppLocalizations.of(context)!;
     final allDone = _aiOk && _mcpOk && _moduleOk && _flowOk;
-    final items = <(bool, String, String)>[
-      (_aiOk, l.welcomeChecklistAi, l.welcomeChecklistAiHint),
-      (_mcpOk, l.welcomeChecklistMcp, l.welcomeChecklistMcpHint),
-      (_moduleOk, l.welcomeChecklistModule, l.welcomeChecklistModuleHint),
-      (_flowOk, l.welcomeChecklistFlow, l.welcomeChecklistFlowHint),
+    // Each row gets an `onTap` that takes the operator to
+    // the page where they can actually complete the item.
+    // Replaces the old "read the hint then guess where the
+    // feature lives" behaviour with a one-click hop.
+    final shell = StudioShellState.of(context);
+    final items = <(bool, String, String, VoidCallback?)>[
+      (
+        _aiOk,
+        l.welcomeChecklistAi,
+        l.welcomeChecklistAiHint,
+        () => FaiSettingsDialog.show(context),
+      ),
+      (
+        _mcpOk,
+        l.welcomeChecklistMcp,
+        l.welcomeChecklistMcpHint,
+        () => FaiSettingsDialog.show(context),
+      ),
+      (
+        _moduleOk,
+        l.welcomeChecklistModule,
+        l.welcomeChecklistModuleHint,
+        shell == null ? null : () => shell.navigateTo('store'),
+      ),
+      (
+        _flowOk,
+        l.welcomeChecklistFlow,
+        l.welcomeChecklistFlowHint,
+        shell == null ? null : () => shell.navigateTo('flows'),
+      ),
     ];
     return Padding(
       padding: const EdgeInsets.only(bottom: FaiSpace.xxl),
@@ -533,6 +559,7 @@ class _OnboardingChecklistState extends State<_OnboardingChecklist> {
                     done: items[i].$1,
                     title: items[i].$2,
                     hint: items[i].$3,
+                    onTap: items[i].$4,
                   ),
                 ],
               ],
@@ -693,18 +720,23 @@ class _ChecklistRow extends StatelessWidget {
   final bool done;
   final String title;
   final String hint;
+  /// Tap handler — takes the operator to the page where
+  /// they can actually complete the item. null = no-op
+  /// (e.g. AI item when System AI was already configured).
+  final VoidCallback? onTap;
 
   const _ChecklistRow({
     required this.done,
     required this.title,
     required this.hint,
+    this.onTap,
   });
 
   @override
   Widget build(BuildContext context) {
     final theme = Theme.of(context);
     final l = AppLocalizations.of(context)!;
-    return Padding(
+    final row = Padding(
       padding: const EdgeInsets.all(FaiSpace.lg),
       child: Row(
         crossAxisAlignment: CrossAxisAlignment.start,
@@ -747,6 +779,11 @@ class _ChecklistRow extends StatelessWidget {
         ],
       ),
     );
+    // Wrap in InkWell only when a tap target exists so done
+    // rows (no action needed) don't shimmer hover-feedback
+    // they can't act on.
+    if (onTap == null) return row;
+    return InkWell(onTap: onTap, child: row);
   }
 }