DetailPanel exposes the currently-shown piece id; Main's key handler
delegates Delete or Backspace to the same path as the Retirer button
when a piece is selected. Harness gains "delete" under key() so UI
tests can exercise the shortcut directly.
EventAnimator now emits CollisionOccurred at the end of the collision
phase, carrying the struck cell and victim/destroyer identity. Main pans
and zooms the camera onto the cell over 0.45s and shows a fading toast
("Pion détruit par Tour — retourné au stock", or "collision mutuelle"
for same-status ties). The toast fades out after 3s and leaves the
camera framing the collision so the player can inspect the aftermath
before resuming.
InputMapper tracks a mouse-down over a placed piece and promotes it to
drag mode once the cursor travels past an 8px threshold. Legal drop
cells (those where the piece's start→end vector still fits a legal
placement) are highlighted in green. Releasing on a legal cell emits a
RelocateRequested signal; Main feeds it to MovePieceCommand, which is
already undoable via the existing history stack.
Escape or releasing on an invalid cell cancels. The harness gains a
relocate() helper so UI tests can script drag-and-drop moves without
synthesizing motion events.
Delete autonomous_plan.md (fully shipped), PLAN_playtest.md (all P1-P7
done), PLAN_missions.md and PLAN_leveldesign.md (partial — engine done,
UI polish + 3 final missions + recurring demands + transformer visuals
remain). The surviving TODO list lives in docs/PLAN.md.
Also add the 6-step dev loop to CLAUDE.md (take next topic → implement →
tests → UI test → docs → commit).
