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/components/home-client.tsx

@@ -4,7 +4,7 @@ import { useState, useEffect, useCallback, useRef } from 'react'
 import { useSearchParams, useRouter } from 'next/navigation'
 import dynamic from 'next/dynamic'
 import { Note } from '@/lib/types'
-import { getAllNotes, searchNotes, enableNoteHistory } from '@/app/actions/notes'
+import { getAllNotes, searchNotes, enableNoteHistory, getNoteById } from '@/app/actions/notes'
 import { NoteInput } from '@/components/note-input'
 import { NotesMainSection, type NotesViewMode } from '@/components/notes-main-section'
 import { NotesViewToggle } from '@/components/notes-view-toggle'
@@ -165,6 +165,33 @@ export function HomeClient({ initialNotes, initialSettings }: HomeClientProps) {
 
   useReminderCheck(notes)
 
+  // Handle ?openNote=ID — open a note from a notification click
+  useEffect(() => {
+    const openNoteId = searchParams.get('openNote')
+    if (!openNoteId) return
+
+    const openNote = async () => {
+      // Try to find the note in current state first
+      const existing = notes.find(n => n.id === openNoteId)
+      if (existing) {
+        setEditingNote({ note: existing, readOnly: false })
+      } else {
+        // Fetch from server
+        const fetched = await getNoteById(openNoteId)
+        if (fetched) {
+          setEditingNote({ note: fetched, readOnly: false })
+        }
+      }
+      // Clean URL — remove openNote param
+      const params = new URLSearchParams(searchParams.toString())
+      params.delete('openNote')
+      router.replace(params.toString() ? `/?${params.toString()}` : '/', { scroll: false })
+    }
+
+    openNote()
+  // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [searchParams])
+
   // Listen for global label deletion and immediately update local state
   useEffect(() => {
     const handler = (e: Event) => {
@@ -321,6 +348,7 @@ export function HomeClient({ initialNotes, initialSettings }: HomeClientProps) {
                 })()}
               </div>
               <h1 className="text-4xl font-bold text-gray-900 dark:text-white tracking-tight">{currentNotebook.name}</h1>
+              <span className="text-sm font-medium text-muted-foreground mt-2">({notes.length})</span>
             </div>
             <div className="flex flex-wrap items-center gap-3">
               <NotesViewToggle mode={notesViewMode} onModeChange={setNotesViewMode} />
@@ -351,6 +379,7 @@ export function HomeClient({ initialNotes, initialSettings }: HomeClientProps) {
                 <FileText className="w-8 h-8 text-primary" />
               </div>
               <h1 className="text-4xl font-bold text-gray-900 dark:text-white tracking-tight">{t('notes.title')}</h1>
+              <span className="text-sm font-medium text-muted-foreground mt-2">{notes.length} {notes.length === 1 ? (t('notes.note') || 'note') : (t('notes.notes') || 'notes')}</span>
             </div>
             <div className="flex flex-wrap items-center gap-3">
               <NotesViewToggle mode={notesViewMode} onModeChange={setNotesViewMode} />