04's settled ruling: the attachment model is flat top-level files, so a
drag containing only folders never engages — no highlight, no proposal,
the standard incompatible-payload cursor — and a mixed drag proposes for
its files only, importing them at the drop while a loss row names the
skipped folders. Hover reads the providers' registered types (anything
conforming to public.directory refuses, packages included); commit
re-partitions authoritatively from the filesystem, so a synthetic
payload that hides its type still can't land a folder. The create path
now only ever fires with at least one importable file — the
mint-fail-remove dance is gone from the folder case and stays reserved
for genuine mid-batch failures.
Claude-Session: https://claude.ai/code/session_01SR4XGjmBE16ZUYWpfFHXwY
Files from Finder land on the board per 04-interactions.md § Drag & drop:
- Dropped on a card, they copy into its attachments/ (any type, multi-file),
the face highlighting while hovered; the hovered card is resolved by
hit-testing the same analytic masonry frames the card zones are built
from, so attach-beats-create adds no drop region and cannot drift from
the dispatch.
- Dropped on lane empty space, one card per file — filename minus extension
as the title (a blank stem omits the key), fresh GUID, rank at the drop
position through the ordinary insertion machinery, the file attached —
all in one bracket; a failed import removes the just-minted card, so
creating-then-abandoning never leaves an empty card behind.
- Every board drop surface now declares .fileURL beside the two board
types (the single-target-dispatch rule); tombstoned surfaces are inert;
file sessions ride a distinct session mode with their own watchdog and
no hysteresis, leaving the board-drag machinery untouched.
- Also: four empty fixture directories pinned with .keep files so git
preserves them, and a test-only visibility fix in DragSessionTests.
811 unit tests (12 new).
Claude-Session: https://claude.ai/code/session_01SR4XGjmBE16ZUYWpfFHXwY
The second half: system drag sessions over phase 1's model, per
DRAG-REORDER.md and 04-interactions.md § Drag & drop.
- Card faces, lane headers, and trash rows drag as NSItemProvider sessions
(two exported UTTypes, JSON payload in flatten order, plain-text titles as
the secondary representation) — replacing m4's custom lane-reorder gesture
and trash drag-out wholesale; the app-wide DragSession carries the members,
the frozen dragged sizes, the live proposal, and the effective operation.
- Three drop delegates (lane masonry, strip, window fallback), each accepting
both types and routing internally per the single-target-dispatch rule; the
cursor is the physical mouse converted to strip space; proposals come from
DropSlotMath with hysteresis threaded through, and the lane-strip proposal
clamps in front of the shown trash.
- Locality picks the default — move within a board, copy across, the badge
tracking live; ⌥ forces copy (ignored on within-board lane drags), ⌘
forces move; trash rows restore within their board (positional), copy out
across boards by default, ⌘ forcing the true restore-move.
- N contiguous shadows with reflow keyed on the proposal; the
committed-overlay hold renders the dropped arrangement until the reload
echo lands (1.5 s dissolution deadline for refused writes); the
re-grounding trio: geometry re-derives per render, proposals re-validate
by liveness at release, an emptied drag cancels itself.
- Edge autoscroll (ticking driver over DragAutoScrollMath, re-targeting per
step), the mouse-up-gated late-event cleanup, and the polling watchdog —
the pathfinder's lifecycle traps, ported.
- Store: moveLanes and multi-card restoreByDrag join the one-bracket drop
commits.
784 unit tests.
Claude-Session: https://claude.ai/code/session_01SR4XGjmBE16ZUYWpfFHXwY
rzen