Build the trash quasi-lane

Deletion becomes a two-stage, Finder-style story. File > Delete and
plain Backspace tombstone the live selection; View > Show Trash (no
chord — Shift-Cmd-T stays with the system's tab bar) reveals the
quasi-lane: trailing, one fixed width unit consumed only while shown,
hatched dimmed header, count badge, no new-card button, exempt from
resize and reorder alike. Its contents are a pure view over the
snapshot — the deterministic sort (deleted newest first, folder-name
ties, unparseable stamps oldest) interleaves card rows with a
tombstoned lane's single entry, whose count names what Put Back
returns; the ancestor walk is absolute, so an own-flag card beneath a
tombstoned lane has no row and recovery is deliberately two steps.
Put Back twins Delete on Cmd-Backspace with validation enabling
exactly one; restore fidelity is byte-perfect because nothing ever
moved. Delete Immediately confirms exactly where loss is real (every
board is mode-none today; the predicate names the git carve-out for
m7), Empty Trash always confirms with the true whole-board count,
and dragging a tombstoned card onto a live lane restores it there —
positional drops and cross-board locality arrive with m5's machinery.
The banner's delete phrasing drops "move to the trash" per the naming
constraint: board deletion says Delete, "Move to Trash" stays
reserved for the system Trash. 47 new tests.

Claude-Session: https://claude.ai/code/session_01SR4XGjmBE16ZUYWpfFHXwY

README.md

@@ -18,6 +18,8 @@ Lanework is in early development. This list tracks what has actually shipped and
 
 - **Styling** — one style editor serves every anchor: a background grid of the twelve palette wells behind a leading None well that *removes* the key, and a curated grid of five dozen kanban-relevant SF Symbols behind a leading level-default well that does the same. It is selection-aware (the selected cards or lanes; the board with nothing selected) and states the current value per dimension across the whole target set — agreement selects a well, disagreement reads "—", and a hand-written hex or uncurated symbol states itself verbatim outside the grids, replaced by any well you choose. A batch applies as one bracketed commit that skips every target already carrying the value, and the open editor tracks its targets live: one deleted out from under it leaves the set, and the last one closes the editor rather than quietly retargeting the board. Reached from Board ▸ Style… (⌥⌘S) or a card's or lane's context menu, where a compact row of app-wide recent colours recolours in one click and a lane's menu also carries its width stepper. Colour renders at all three levels — a card's `background` as a left-edge stripe, a lane's as a full-width band along its top edge, the board's as the window's content background — each painting nothing at all when the value doesn't resolve, bytes on disk untouched.
 
+- **The trash** — deletion is two-stage and Finder-shaped. File ▸ Delete (⌘⌫, or a plain ⌫) tombstones the selection in place — cards or lanes, one bracketed write for the whole batch — and View ▸ Show Trash reveals a trailing quasi-lane where tombstoned items live. It is a pure view: nothing moves on disk, so Put Back is byte-perfect and returns an item to its old position. The column takes exactly one width unit while shown, so showing it re-divides the window rather than resizing it. Its order is fully deterministic (newest deletion first, ties by folder name, an unreadable timestamp sorting oldest) and its ancestor walk is absolute — a tombstoned lane is one entry subsuming everything beneath it, its count naming the cards Put Back would return, so recovering a separately deleted card inside it is deliberately two steps. Drag a row out onto any lane to restore it there. Purging is Delete Immediately (⌥⌘⌫) and Empty Trash… (⇧⌘⌫), each confirmed where the loss is real and named by count; Empty Trash always covers the whole trash, never just what a filter is showing. Nothing edit-shaped — Open, Rename, Style… — applies to a tombstoned selection, and a selection never mixes trashed with live.
+
 - **The board popover** — a quiet chevron beside the window title (File ▸ Board Info, ⌘I, which toggles it) opens the board's one configuration surface. Renaming edits the board's frontmatter `title` and nothing else — the folder is never renamed, so the app's display name and the Finder document name are free to diverge — and clearing the field removes the key entirely, dropping the window title back to the folder name rather than to "Untitled"; the edit commits on Return and on click-away, Escape abandons it, and an unchanged title writes nothing at all. Below it sits the same style editor every other anchor uses, aimed permanently at the board, and below that a Git section that says plainly that this board has no repository yet. The read-only lock disables the surface without closing it.
 
 ## Development