feat: Find & Replace dans l'éditeur (Ctrl+F) + corrections Toggle/Callout/Outline

- Find & Replace : barre flottante Ctrl+F, recherche instantanée synchrone
  - Highlights ProseMirror (jaune = match, orange = actif)
  - Scroll vers le match sans voler le focus de l'input
  - Options: sensible à la casse, regex
  - Remplacer / Tout remplacer
  - i18n FR/EN complet
- Toggle/Callout/Outline: corrections bugs + design

memento-note/components/rich-text-editor.tsx

@@ -29,6 +29,7 @@ import { StructuredViewBlockExtension, insertStructuredViewBlockAtSelection } fr
 import { ToggleExtension, insertToggleBlock } from './tiptap-toggle-extension'
 import { CalloutExtension, insertCalloutBlock } from './tiptap-callout-extension'
 import { OutlineExtension, insertOutlineBlock } from './tiptap-outline-extension'
+import { FindReplaceBar, FindReplaceExtension } from './editor-find-replace-bar'
 import { RtlPreserveExtension } from './tiptap-rtl-preserve-extension'
 import { ClipArticleExtension } from './tiptap-clip-article-extension'
 import { BlockPicker, type BlockSuggestion } from './block-picker'
@@ -306,6 +307,20 @@ export const RichTextEditor = forwardRef<RichTextEditorHandle, RichTextEditorPro
     } | null>(null)
     const [isMobile, setIsMobile] = useState(false)
     const [actionSheetOpen, setActionSheetOpen] = useState(false)
+    const [showFindReplace, setShowFindReplace] = useState(false)
+
+    useEffect(() => {
+      const handleFindShortcut = (e: KeyboardEvent) => {
+        if ((e.metaKey || e.ctrlKey) && e.key === 'f' && !e.shiftKey) {
+          const target = e.target as HTMLElement
+          if (target.tagName === 'INPUT' || target.tagName === 'TEXTAREA') return
+          e.preventDefault()
+          setShowFindReplace(v => !v)
+        }
+      }
+      document.addEventListener('keydown', handleFindShortcut)
+      return () => document.removeEventListener('keydown', handleFindShortcut)
+    }, [])
     const [noteLinkPickerOpen, setNoteLinkPickerOpen] = useState(false)
     const [noteLinkQuery, setNoteLinkQuery] = useState('')
     const noteLinkRangeRef = useRef<{ from: number; to: number } | null>(null)
@@ -442,6 +457,7 @@ export const RichTextEditor = forwardRef<RichTextEditorHandle, RichTextEditorPro
         ToggleExtension,
         CalloutExtension,
         OutlineExtension,
+        FindReplaceExtension,
         ClipArticleExtension,
         RtlPreserveExtension,
         Placeholder.configure({
@@ -1098,6 +1114,10 @@ export const RichTextEditor = forwardRef<RichTextEditorHandle, RichTextEditorPro
 
         <EditorContent editor={editor} />
 
+        {editor && showFindReplace && (
+          <FindReplaceBar editor={editor} onClose={() => setShowFindReplace(false)} />
+        )}
+
         {editor && blockMenuState && (
           <BlockActionMenu
             editor={editor}