feat: implement three-mode UI system (Easy / Pro / Chat)

Add switchable UI modes with conditional rendering:
- Easy mode: goal-based interface with 7 guided workflows
- Pro mode: current technical interface preserved with Quick Start Goals
- Chat mode: AIUI placeholder for future integration

New components: ModeSwitcher, EasyHome, GoalDetail wizard, Chat placeholder
New stores: uiMode (mode persistence), goals (progress tracking)
New data: goal definitions catalog, helpTree goals section
Modified: Dashboard (reactive nav), Home (mode dispatcher), Settings (mode picker),
Router (goal/chat routes), Spotlight (goal search integration)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

neode-ui/src/data/helpTree.ts

@@ -16,7 +16,7 @@ export interface SearchableItem {
   id: string
   label: string
   path?: string
-  type: 'navigate' | 'learn' | 'action'
+  type: 'navigate' | 'learn' | 'action' | 'goal'
   section: string
   content?: string
   relatedPath?: string
@@ -71,6 +71,19 @@ export const helpTree: HelpSection[] = [
       { id: 'backup', label: 'Backup & Recovery', path: '/dashboard/settings' },
     ],
   },
+  {
+    id: 'goals',
+    label: 'Quick Start Goals',
+    items: [
+      { id: 'goal-shop', label: 'Open a Shop', path: '/dashboard/goals/open-a-shop' },
+      { id: 'goal-payments', label: 'Accept Payments', path: '/dashboard/goals/accept-payments' },
+      { id: 'goal-photos', label: 'Store My Photos', path: '/dashboard/goals/store-photos' },
+      { id: 'goal-files', label: 'Store My Files', path: '/dashboard/goals/store-files' },
+      { id: 'goal-lightning', label: 'Run a Lightning Node', path: '/dashboard/goals/run-lightning-node' },
+      { id: 'goal-identity', label: 'Create My Identity', path: '/dashboard/goals/create-identity' },
+      { id: 'goal-backup', label: 'Back Up Everything', path: '/dashboard/goals/back-up-everything' },
+    ],
+  },
 ]
 
 export function flattenForSearch(): SearchableItem[] {
@@ -81,7 +94,9 @@ export function flattenForSearch(): SearchableItem[] {
         ? 'navigate'
         : section.id === 'learn'
           ? 'learn'
-          : 'action'
+          : section.id === 'goals'
+            ? 'goal'
+            : 'action'
     for (const item of section.items) {
       result.push({
         id: item.id,