feat: 8 AI providers, rich text editor, agent notifications, UI contrast & font settings

- Add DeepSeek, OpenRouter, Mistral, Z.AI, LM Studio as AI providers
  with editable model names via Combobox in admin settings
- Fix OpenRouter broken by normalizeProvider bug in config.ts
- Convert agent-created notes from Markdown to HTML (TipTap rich text)
- Add Notification model + in-app notifications for agent results
- Agent notification click opens the created note directly
- Add note count display on notebook and inbox headers
- Fix checklist toggle in card view (persist state via localCheckItems)
- Add checklist creation option in tabs/list view (dropdown on + button)
- Fix image description ENOENT error with HTTP fallback
- Improve UI contrast across all themes (input, border, checkbox visibility)
- Add font family setting (Inter vs System Default) in Appearance settings
- Fix CSS font-sans variable conflict (removed dead Geist references)
- Update README with new features and 8 providers

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

memento-note/app/actions/notifications.ts

@@ -0,0 +1,76 @@
+'use server'
+
+import { prisma } from '@/lib/prisma'
+import { auth } from '@/auth'
+
+export interface AppNotification {
+  id: string
+  type: string
+  title: string
+  message: string | null
+  read: boolean
+  actionUrl: string | null
+  relatedId: string | null
+  createdAt: Date
+}
+
+export async function getUnreadNotifications(): Promise<AppNotification[]> {
+  const session = await auth()
+  if (!session?.user?.id) return []
+
+  try {
+    const notifications = await prisma.notification.findMany({
+      where: { userId: session.user.id, read: false },
+      orderBy: { createdAt: 'desc' },
+      take: 20,
+    })
+    return notifications
+  } catch {
+    return []
+  }
+}
+
+export async function markNotificationRead(id: string): Promise<void> {
+  const session = await auth()
+  if (!session?.user?.id) return
+
+  await prisma.notification.updateMany({
+    where: { id, userId: session.user.id },
+    data: { read: true },
+  })
+}
+
+export async function markAllNotificationsRead(): Promise<void> {
+  const session = await auth()
+  if (!session?.user?.id) return
+
+  await prisma.notification.updateMany({
+    where: { userId: session.user.id, read: false },
+    data: { read: true },
+  })
+}
+
+/** Create a notification (called from server-side code, not exposed to client) */
+export async function createNotification(data: {
+  userId: string
+  type: string
+  title: string
+  message?: string
+  actionUrl?: string
+  relatedId?: string
+}): Promise<void> {
+  try {
+    await prisma.notification.create({
+      data: {
+        userId: data.userId,
+        type: data.type,
+        title: data.title,
+        message: data.message || null,
+        actionUrl: data.actionUrl || null,
+        relatedId: data.relatedId || null,
+      },
+    })
+  } catch (e) {
+    console.error('[Notification] Failed to create:', e)
+  }
+}