fix: unify theme system - fix theme switching persistence

- Unified localStorage key to 'theme-preference' across all components
- Fixed header.tsx using wrong localStorage key ('theme' instead of 'theme-preference')
- Added localStorage hybrid persistence for instant theme changes
- Removed router.refresh() which was causing stale data revert
- Replaced Blue theme with Sepia
- Consolidated auth() calls to prevent race conditions
- Updated UserSettingsData types to include all themes

mcp-server/prisma/schema.prisma

@@ -9,17 +9,168 @@ datasource db {
 }
 
 model Note {
+  id                 String              @id @default(cuid())
+  title              String?
+  content            String
+  color              String              @default("default")
+  isPinned           Boolean             @default(false)
+  isArchived         Boolean             @default(false)
+  type               String              @default("text")
+  checkItems         String?
+  labels             String?
+  images             String?
+  links              String?
+  reminder           DateTime?
+  isReminderDone     Boolean             @default(false)
+  reminderRecurrence String?
+  reminderLocation   String?
+  isMarkdown         Boolean             @default(false)
+  size               String              @default("small")
+  embedding          String?
+  sharedWith         String?
+  userId             String?
+  order              Int                 @default(0)
+  notebookId         String?
+  createdAt          DateTime            @default(now())
+  updatedAt          DateTime            @updatedAt
+  autoGenerated      Boolean?
+  aiProvider         String?
+  aiConfidence       Int?
+  language           String?
+  languageConfidence Float?
+  lastAiAnalysis     DateTime?
+}
+
+model Notebook {
+  id        String   @id @default(cuid())
+  name      String
+  icon      String?
+  color     String?
+  order     Int
+  userId    String
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+}
+
+model Label {
+  id         String    @id @default(cuid())
+  name       String
+  color      String    @default("gray")
+  notebookId String?
+  userId     String?
+  createdAt  DateTime  @default(now())
+  updatedAt  DateTime  @updatedAt
+}
+
+model User {
+  id                 String              @id @default(cuid())
+  name               String?
+  email              String              @unique
+  emailVerified      DateTime?
+  password           String?
+  role               String              @default("USER")
+  image              String?
+  theme              String              @default("light")
+  resetToken         String?             @unique
+  resetTokenExpiry   DateTime?
+  createdAt          DateTime            @default(now())
+  updatedAt          DateTime            @updatedAt
+}
+
+model Account {
+  userId            String
+  type              String
+  provider          String
+  providerAccountId String
+  refresh_token     String?
+  access_token      String?
+  expires_at        Int?
+  token_type        String?
+  scope             String?
+  id_token          String?
+  session_state     String?
+  createdAt         DateTime @default(now())
+  updatedAt         DateTime @updatedAt
+
+  @@id([provider, providerAccountId])
+}
+
+model Session {
+  sessionToken String   @unique
+  userId       String
+  expires      DateTime
+  createdAt    DateTime @default(now())
+  updatedAt    DateTime @updatedAt
+}
+
+model VerificationToken {
+  identifier String
+  token      String
+  expires    DateTime
+
+  @@id([identifier, token])
+}
+
+model NoteShare {
   id          String    @id @default(cuid())
-  title       String?
-  content     String
-  color       String    @default("default")
-  type        String    @default("text")
-  checkItems  String?
-  labels      String?
-  images      String?
-  isPinned    Boolean   @default(false)
-  isArchived  Boolean   @default(false)
-  order       Int       @default(0)
+  noteId      String
+  userId      String
+  sharedBy    String
+  status      String    @default("pending")
+  permission  String    @default("view")
+  notifiedAt  DateTime?
+  respondedAt DateTime?
   createdAt   DateTime  @default(now())
   updatedAt   DateTime  @updatedAt
+
+  @@unique([noteId, userId])
+}
+
+model SystemConfig {
+  key   String @id
+  value String
+}
+
+model AiFeedback {
+  id               String   @id @default(cuid())
+  noteId           String
+  userId           String?
+  feedbackType     String
+  feature          String
+  originalContent  String
+  correctedContent String?
+  metadata         String?
+  createdAt        DateTime  @default(now())
+}
+
+model MemoryEchoInsight {
+  id              String   @id @default(cuid())
+  userId          String?
+  note1Id         String
+  note2Id         String
+  similarityScore Float
+  insight         String
+  insightDate     DateTime @default(now())
+  viewed          Boolean  @default(false)
+  feedback        String?
+  dismissed       Boolean  @default(false)
+
+  @@unique([userId, insightDate])
+}
+
+model UserAISettings {
+  userId                 String  @id
+  titleSuggestions       Boolean @default(true)
+  semanticSearch         Boolean @default(true)
+  paragraphRefactor      Boolean @default(true)
+  memoryEcho             Boolean @default(true)
+  memoryEchoFrequency    String  @default("daily")
+  aiProvider             String  @default("auto")
+  preferredLanguage      String  @default("auto")
+  fontSize               String  @default("medium")
+  demoMode               Boolean @default(false)
+  showRecentNotes        Boolean @default(false)
+  emailNotifications      Boolean @default(false)
+  desktopNotifications   Boolean @default(false)
+  anonymousAnalytics      Boolean @default(false)
 }