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@@ -339,6 +339,9 @@ Inbox only. New cross-cutting working-style preferences go into §Workflow And R
 
 - After substantive pad/TOC/design-system/chatroom work, run the continual-learning memory updater so regressions are not repeated.
 - Settings Documents list UX should follow a Google Docs-like per-row ⋮ menu, not inline visibility toggles. The menu lists Open, Copy link when public, Rename, Duplicate, Favorite or Unfavorite, then Private and Read-only. Favorite sits after Duplicate and before the Private divider. No toolbar star. Name is Favorite, never Bookmark or Pin (see CONTEXT.md §Documents list). Keep it minimal and size-fit for the settings panel. On mobile the Documents toolbar must stay 44px-target size-fit (flex/truncate sort, icon-only Trash, no desktop-width overflow). Private ON must clear and disable Read-only on that menu and on `DocumentSettingsPanel` (see §Document Access).
+- Date sorts on Settings → Documents use Date buckets on the rest after Favorites. No Favorites heading.
+- Last opened is a sort. The pad owner stamps `lastOpenedAt` via `POST /api/documents/:documentId/opened`. Last modified does not move.
+- Owner live list and Owner Trash list lead with `size-10` DocumentPreviewPaper (DocumentGridPreview), not `LuFileText`. Grid is 4/3 first-page paper. No screenshot thumbs. Create stays empty-state only.
 - TOC long heading titles must wrap (e.g. `text-pretty` / `whitespace-pre-line`), never truncate — use the full row width left of the trailing chat/unread rail. Tree connectors use daisyUI nested menu rails on `toc__children` only (vertical rails, no L-elbows). Accept stock rail opacity — do not reintroduce a TOC `::before` strengthen overwrite.
 - Mobile heading control stays a one-frame stepper, name first: `[name | − | +]`. Do not replace it with a chip that opens a list. The three cells share one join; no inner box around plus and minus. When the caret is Title, the join uses the same `is-active` color as other heading levels.
 - TOC chat/unread/presence all live in-flow in `TocRowTrail`. Desktop presence is `<AvatarStack anchor="right">` right of the chat trigger (right-anchored, fixed right edge, grows left, `translate-x-3` to the column inner edge). The scrollbar must stay inside the column, so do NOT widen `.toc__scroll` to overhang presence beyond the wrapper. That widening pushed the scrollbar out over the editor. Fix broken shipped UI motion (e.g. `RollingNumber`) in place — never strip it for a static fallback unless the maintainer asks.
 
@@ -22,6 +22,16 @@ This file is the product changelog. It names the live webapp. The hocuspocus app
   export turns a lone video, audio, or embed URL into a player, and writes each
   picture's natural width and height. A labeled link and a filter link stay links.
   Paste of a bare file address is unchanged.
+- Paint a first-page paper on Settings → Documents grid, list, and Trash. The
+  paper paints stored DocumentGridPreview JSON in React. It is not a screenshot.
+  Empty paper shows “Empty document”.
+- Sort Settings → Documents by Last opened. Opening an owned pad stamps Last
+  opened. Last modified does not move. A document never opened shows
+  “Never opened”.
+- Group the rest of the list and the grid with date headers: Today, Yesterday,
+  Previous 7 days, Previous 30 days, and Earlier. Favorites stay unbucketed at
+  the top, then a hairline. Title sorts stay a flat list. Last opened sort also
+  uses Never opened when `lastOpenedAt` is null.
 
 ### Fixed
 
 
@@ -13,7 +13,16 @@ Shared names for docs.plus domain concepts. Architecture reviews and deepenings
 
 ## Documents list
 
-- **Favorite** — a per-user mark that pins a document to the top of Settings → Documents. Stored as `DocumentFavorite` (`userId` + `documentId`). Owner-only. Soft-delete keeps the row; purge cascade drops it. Not **Bookmark** (chat messages and the hyperlink picker) and not **Pin** (channel messages).
+- **Favorite** — a per-user mark that pins a document to the top of Settings → Documents. Stored as `DocumentFavorite` (`userId` + `documentId`). Owner-only. Soft-delete keeps the row; purge cascade drops it.
+  _Avoid_: Bookmark (chat messages and the hyperlink picker), Pin (channel messages)
+- **Owner live list** — the owner's undeleted Documents in Settings. Pins Favorites first. Includes `isFavorite`, DocumentGridPreview, and Last opened.
+  _Avoid_: public fleet (omits Favorite, DocumentGridPreview, and Last opened)
+- **Owner Trash list** — the owner's soft-deleted Documents. Includes DocumentGridPreview and Last opened. Omits Favorite. Same NULL fill as the Owner live list.
+  _Avoid_: Owner live list
+- **DocumentGridPreview** — the first-page extract painted on Documents paper (grid, list thumb, Trash thumb). SQL NULL means never extracted. `{ heading: null, lines: [] }` means empty or a failed extract. The paper omits heading at paint when it equals Title.
+  _Avoid_: DocumentPreview (admin stale-doc shape), screenshot, thumbnail
+- **Last opened** — `DocumentMetadata.lastOpenedAt`, stamped when the owner opens the pad. Sort key `lastOpenedAt_desc`. Does not move Last modified. Owner lists only.
+- **Date buckets** — Today / Yesterday / Previous 7 days / Previous 30 days / Earlier / Never opened. Used on date sorts in Settings → Documents. Favorites stay unbucketed. Never opened is for a null sort timestamp (Last opened with no stamp).
 
 ## Document access