Move a note in one press, and stop Draw inventing a page

Moving lived under a right-click, behind a submenu: two steps before the
list of places appeared at all, and on a phone a long press followed by a
flyout. There is a button on the row now, and it opens one screen with
the chapters of this notebook and the other notebooks together, marking
where the note already is.

The spare sheet in Draw mode was drawn as solid paper, so pressing Draw
on a one-page note made a second page appear from nowhere while the count
still said "of 1". It exists for a good reason — pages otherwise come
only from how far the writing runs, so drawing on page two would mean
writing two pages first — but it should look like the offer it is. Dashed
outline, half opacity, and it says what it is for. It counts once
something is on it.

And the two buttons above the list did not match: the one I added last
round was larger and bolder than the one it sat beside, and the older
one's target was nineteen pixels tall, which a finger misses. Both are
one shape now. A separator's label matches a chapter's name in size for
the same reason — two type treatments in one list is noise, and the
difference was not saying anything.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

frontend/src/App.jsx

@@ -13,6 +13,7 @@ import { I } from "./ui/icons.jsx";
 import { makeTheme, FONT_UI } from "./ui/theme";
 import { ConfirmDialog } from "./ui/ConfirmDialog.jsx";
 import { NameDialog } from "./ui/NameDialog.jsx";
+import { MoveNoteDialog } from "./ui/MoveNoteDialog.jsx";
 import { ContextMenu } from "./ui/ContextMenu.jsx";
 import { EditNotebookModal, CreateNotebookModal } from "./ui/NotebookModals.jsx";
 import { AccountMenu } from "./ui/AccountMenu.jsx";
@@ -90,6 +91,8 @@ export default function App() {
   const [ctxMenu, setCtxMenu] = useState(null);
   // { title, value, onSave } while a chapter is being named or renamed.
   const [namingChapter, setNamingChapter] = useState(null);
+  // The note whose destination is being chosen, if any.
+  const [movingNote, setMovingNote] = useState(null);
   const [confirmDialog, setConfirmDialog] = useState(null);
   // Bumped on a version restore to force a fresh editor on the restored body.
   const [restoreEpoch, setRestoreEpoch] = useState(0);
@@ -776,6 +779,7 @@ export default function App() {
               onOpenChapter={setActiveChapter}
               onAddChapter={activeNotebook ? addChapter : null}
               onChapterContextMenu={chapterContextMenu}
+              onMoveNote={setMovingNote}
               onReorder={rearrangeNotes}
               onToggleSidebar={() => setSidebarOpen(!sidebarOpen)}
               onSelectNote={openNote}
@@ -900,6 +904,16 @@ export default function App() {
           )}
         />
       )}
+      {movingNote && (
+        <MoveNoteDialog
+          note={movingNote}
+          notebooks={notebooks}
+          chapters={data.chapters}
+          onMove={(id, folderId, chapterId) => data.moveNote(id, folderId, chapterId)}
+          onClose={() => setMovingNote(null)}
+          dark={dark}
+        />
+      )}
       {namingChapter && (
         <NameDialog
           title={namingChapter.title}