The `subpages` node showed only one level of direct children. Add a `recursive`
attribute that renders the FULL descendant tree of the current page — fully
expanded, unlimited depth. Default `false`, so every previously-inserted node
stays flat (backward compatible). No backend changes: `POST /pages/tree` (via the
`getSpaceTree` wrapper) already returns the whole subtree as a flat `IPage[]`
(recursive CTE, permission-filtered); the nested tree is built on the client by
`parentPageId`.
- editor-ext `subpages.ts`: `recursive` attribute (parse/render `data-recursive`),
shared by client + server so the collab ProseMirror schema keeps the attribute.
- `getSpaceTree`: arg loosened to `{ spaceId?; pageId? }` (the endpoint accepts
either); new `useGetPageTreeQuery(pageId)` react-query hook.
- `subpages-view.tsx`: split into `FlatSubpages` (unchanged) and
`RecursiveSubpages`; `buildSubtree` assembles the nested tree (cycle/self-parent
guard, `sortPositionKeys` per level, root excluded) and a recursive `TreeNode`
renders it (16px indent per depth, soft "showing N" note past 300 — data never
capped). Shared/public context reads the already-nested shared tree, no
`/pages/tree` request.
- toggles: bubble-menu flat⇄tree button + a second slash-menu item "Page tree".
Review follow-ups folded in: invalidate `["page-tree"]` from the create / update /
move / delete cache helpers so an open recursive tree refreshes (no stale data);
mode icon made reactive on editor transactions; `t` threaded into `TreeNode`
(no per-node useTranslation); shared-subtree hook deduped to a thin alias.
editor-ext build + client `tsc --noEmit` both clean. Backend untouched.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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