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/types/api.ts

@@ -28,11 +28,14 @@ export interface StatusInfo {
   'update-progress': number | null
 }
 
+export type UIMode = 'gamer' | 'easy' | 'chat'
+
 export interface UIData {
   name: string | null
   'ack-welcome': string
   marketplace: UIMarketplaceData
   theme: string
+  mode?: UIMode
 }
 
 export interface UIMarketplaceData {

neode-ui/src/types/goals.ts

@@ -0,0 +1,32 @@
+// Goal-based workflow types for Easy mode
+
+export interface GoalDefinition {
+  id: string
+  title: string
+  subtitle: string
+  icon: string
+  category: 'commerce' | 'payments' | 'storage' | 'identity' | 'network' | 'backup'
+  requiredApps: string[]
+  steps: GoalStep[]
+  estimatedTime: string
+  difficulty: 'beginner' | 'intermediate'
+}
+
+export interface GoalStep {
+  id: string
+  title: string
+  description: string
+  appId?: string
+  action: 'install' | 'configure' | 'verify' | 'info'
+  isAutomatic: boolean
+}
+
+export type GoalStatus = 'not-started' | 'in-progress' | 'completed' | 'error'
+
+export interface GoalProgress {
+  goalId: string
+  status: GoalStatus
+  currentStepIndex: number
+  completedSteps: string[]
+  startedAt?: number
+}