The copy now walks the source tree item by item, checking cancellation
between items, and the in-progress banner row carries its promised
Cancel — a cancelled duplicate removes the partial sibling and never
happened (DESIGN/03 > File menu). A sandbox permission refusal of the
silent Finder-style sibling falls back to an NSSavePanel pre-filled with
the parent folder and the copy name — the panel's grant is the sandbox's
own answer; cancelling the panel cancels quietly, and non-permission
failures keep the ordinary one-shot banner. Refusal classification is
deliberately narrow (NSFileWriteNoPermissionError itself, no underlying-
chain walk) so an unreadable source never masquerades as a destination
refusal. Directories are created writable first with mode and timestamps
restored after the subtree lands, so a read-only source folder can't
strand its own copy. BoardDuplicatorTests grows from 9 to 18 tests.
Claude-Session: https://claude.ai/code/session_01SR4XGjmBE16ZUYWpfFHXwY
The welcome window becomes the real thing: Xcode-style, hidden title
bar with background drag, branding and actions left, recents right —
rows carrying the board symbol, name, location, and the registry's
cached lane/card counts (stamped at close, never a scan at welcome
time), sorted by last opened. Launch failures surface row-level per
02: a failure joins its recents row as a warning caption, an
unresolvable bookmark renders unavailable with Forget its one
affordance, and only a failure with no row to carry it falls back to
a compact list; a board opening again heals its row. New Board
(Opt-Cmd-N) opens the Pages-style template chooser — shipped with
the single Basic template and the m9 seams marked — flowing through
the save panel into createBoard/createLane and straight into a board
window. Open Recent gains its submenu with Clear Menu (byte-identical
to forgetting every row, pinned by test), and File > Duplicate forks
the frontmost board to a Finder-style copy sibling: pending work
flushes first through the close flush's step two alone (sessions stay
open — 09's stated exception), every GUID and tombstone carries (the
whole-board carve-out from copies-remint), and the copy opens in its
own window while the original stays put. 36 new tests.
Claude-Session: https://claude.ai/code/session_01SR4XGjmBE16ZUYWpfFHXwY
rzen