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/notes-tabs-view.tsx

@@ -19,7 +19,7 @@ import {
   useSortable,
 } from '@dnd-kit/sortable'
 import { CSS } from '@dnd-kit/utilities'
-import { Note, NOTE_COLORS, NoteColor } from '@/lib/types'
+import { Note, NOTE_COLORS, NoteColor, NoteType } from '@/lib/types'
 import { cn } from '@/lib/utils'
 import { NoteInlineEditor } from '@/components/note-inline-editor'
 import { useLanguage } from '@/lib/i18n'
@@ -65,6 +65,7 @@ import {
 import {
   DropdownMenu,
   DropdownMenuContent,
+  DropdownMenuItem,
   DropdownMenuRadioGroup,
   DropdownMenuRadioItem,
   DropdownMenuSeparator,
@@ -737,11 +738,13 @@ export function NotesTabsView({
   const selected = items.find((n) => n.id === selectedId) ?? null
   const colorKey = selected ? getColorKey(selected) : 'default'
 
-  const handleCreateNote = () => {
+  const handleCreateNote = (noteType: NoteType = 'richtext') => {
     startCreating(async () => {
       try {
         const newNote = await createNote({
-          content: '',
+          content: noteType === 'checklist' ? '' : '',
+          type: noteType,
+          checkItems: noteType === 'checklist' ? [{ id: Date.now().toString(), text: '', checked: false }] : undefined,
           title: undefined,
           notebookId: currentNotebookId || undefined,
           skipRevalidation: true
@@ -843,19 +846,32 @@ export function NotesTabsView({
               </DropdownMenuContent>
             </DropdownMenu>
 
-            {/* New note button */}
-            <Button
-              variant="ghost"
-              size="sm"
-              className="h-7 w-7 p-0 text-muted-foreground/70 hover:bg-primary/8 hover:text-primary"
-              onClick={handleCreateNote}
-              disabled={isCreating}
-              title={t('notes.newNote')}
-            >
-              {isCreating
-                ? <Loader2 className="h-3.5 w-3.5 animate-spin" />
-                : <Plus className="h-4 w-4" />}
-            </Button>
+            {/* New note button — dropdown to choose type */}
+            <DropdownMenu>
+              <DropdownMenuTrigger asChild>
+                <Button
+                  variant="ghost"
+                  size="sm"
+                  className="h-7 w-7 p-0 text-muted-foreground/70 hover:bg-primary/8 hover:text-primary"
+                  disabled={isCreating}
+                  title={t('notes.newNote')}
+                >
+                  {isCreating
+                    ? <Loader2 className="h-3.5 w-3.5 animate-spin" />
+                    : <Plus className="h-4 w-4" />}
+                </Button>
+              </DropdownMenuTrigger>
+              <DropdownMenuContent align="end" className="min-w-[160px]">
+                <DropdownMenuItem onClick={() => handleCreateNote('richtext')}>
+                  <FileText className="h-4 w-4 mr-2" />
+                  {t('notes.newNote') || 'Note'}
+                </DropdownMenuItem>
+                <DropdownMenuItem onClick={() => handleCreateNote('checklist')}>
+                  <ListChecks className="h-4 w-4 mr-2" />
+                  {t('notes.newChecklist') || 'Checklist'}
+                </DropdownMenuItem>
+              </DropdownMenuContent>
+            </DropdownMenu>
           </div>
         </div>