notes: user-defined folders with drag-drop (task #413)

DB
- New `note_folders` table (per-user unique name); `notes.folder_id` nullable
  with `ON DELETE SET NULL` so deleting a folder preserves its notes.

API
- /note-folders CRUD (GET, POST, PATCH, DELETE), all user-scoped.
- /notes POST/PATCH validate folder ownership before assignment (no cross-user
  folder bleed).
- Folder noteCount is tab-aware (active vs archived) via ?archived=.
- OpenAPI spec extended with /note-folders endpoints, NoteFolder schema, and
  folderId on SentNote/ReceivedNote. Codegen regenerated for api-client-react
  and api-zod (`pnpm --filter @workspace/api-spec run codegen`).

Client
- NoteFolder type and useNoteFolders / useCreateFolder / useUpdateFolder /
  useDeleteFolder / useMoveNoteToFolder hooks (optimistic across all
  ["notes", ...] caches; rollback on error).

UI (FoldersRail next to My Notes + Archive tabs only)
- Desktop: sidebar with All / Unfiled / user folders + counts.
- Mobile: horizontal chip row (flex + overflow-x-auto) above the notes grid.
- Per-folder kebab dropdown with Rename + Delete.
- Newly-created folder is auto-selected.
- HTML5 draggable note cards on desktop; touch long-press fallback (350ms)
  for iPad/mobile via shared drop pipeline (registerFolderDropHandler +
  hit-tested `[data-folder-drop]`).
- Dev-only `window.__notesTouchTest` helper (gated to non-production builds)
  exposes the touch pipeline so e2e tests can drive it deterministically
  without synthesizing native TouchEvents.

Bilingual
- notes.folders.* keys added to en.json and ar.json (RTL inherited from
  existing dir prop wired from i18n.language).

Tests (artifacts/tx-os/tests/notes-folders.spec.mjs)
- create folder + auto-select
- drag note → folder, refresh-and-still-in-folder persistence
- filter by folder / Unfiled / All
- drag between folders (count math)
- rename via kebab
- delete a non-empty folder via kebab → notes return to Unfiled (FK SET NULL)
- cross-user folder rejection (400)
- Arabic + RTL render
- separate touch test (414×800, hasTouch+isMobile) covers chip-row layout
  and exercises the touch drop pipeline through window helper.

All API node tests + tx-os Playwright suite + tsc clean.

lib/api-client-react/src/generated/api.schemas.ts

@@ -1090,6 +1090,27 @@ export interface NoteRecipientSummary {
   recipient?: NoteUserSummary | null;
 }
 
+/**
+ * A note owned by the caller (My Notes / Archive view).
+ */
+export interface MyNote {
+  id: number;
+  userId: number;
+  title: string;
+  content: string;
+  color: string;
+  isPinned: boolean;
+  isArchived: boolean;
+  /**
+   * Owning folder id, or null for Unfiled.
+   * @nullable
+   */
+  folderId: number | null;
+  createdAt: string;
+  updatedAt: string;
+  labelIds: number[];
+}
+
 export interface NoteFolder {
   id: number;
   userId: number;
@@ -1730,8 +1751,6 @@ export type ListMyNotesAliasParams = {
   archived?: boolean;
 };
 
-export type ListMyNotesAlias200Item = { [key: string]: unknown };
-
 export type ListReceivedNotesParams = {
   archived?: boolean;
 };

lib/api-client-react/src/generated/api.ts

@@ -79,13 +79,13 @@ import type {
   LeaveConversationBody,
   ListAuditLogsParams,
   ListGroupsParams,
-  ListMyNotesAlias200Item,
   ListMyNotesAliasParams,
   ListNoteFoldersParams,
   ListReceivedNotesParams,
   ListUsersParams,
   LoginBody,
   MessageWithSender,
+  MyNote,
   NoteFolder,
   NoteReply,
   NoteThread,
@@ -8290,14 +8290,11 @@ export const getListMyNotesAliasUrl = (params?: ListMyNotesAliasParams) => {
 export const listMyNotesAlias = async (
   params?: ListMyNotesAliasParams,
   options?: RequestInit,
-): Promise<ListMyNotesAlias200Item[]> => {
-  return customFetch<ListMyNotesAlias200Item[]>(
-    getListMyNotesAliasUrl(params),
-    {
-      ...options,
-      method: "GET",
-    },
-  );
+): Promise<MyNote[]> => {
+  return customFetch<MyNote[]>(getListMyNotesAliasUrl(params), {
+    ...options,
+    method: "GET",
+  });
 };
 
 export const getListMyNotesAliasQueryKey = (