* M12: stamps stick to the objects they land on
A stamp sticks to the topmost object under its centre (BoardItem::Stamp gains an optional on, left out when empty so older files open with stamps on nothing) and the board's normalize pass carries it when that object moves or turns, once when both move together. A stamp dragged onto another object sticks to that one, off everything to nothing; one whose object is deleted stays where it is. Gap 24.
* M12: the object a stamp will stick to is highlighted
While the stamp tool is over an object, or a stamp is dragged over one, the object it will stick to is outlined with the canvas's hover outline (Overlay::stamp_target, found by the same stamp_target as board.stamp and settle_stamps). A drag no longer drops what it moves into the auto layout of a sticky, shape with text or table: board objects take no drops; a stamp already inside its sticky moves with it once. Builds on #1671. Gap 24.
The board connector router moves, unchanged, from the engine into figcraft-doc (route_points, RouteEnd) so the .fig importer can use it: an elbowed or curved connector saved without its path runs in right angles or one curve from the side of each layer it joins (the file's magnet, else the edge its point is on, else the side facing the other end). Straight connectors are unchanged. Gap 1.
* M12: create the next board shape already connected (#1597)
A selected sticky or shape shows a + beside each side; hovering one previews where the next goes, clicking makes one of the same kind, size and colour there, joined by a connector, and starts typing in it, in one undo step. board.addConnected {id?, side?, edit?} does it from commands.
* M12: the connected-shape handle and command in every full catalog (#1597)
* M12: Shift+Cmd/Ctrl+Enter on a board shape adds the next one already connected (#1597)
The board canvas's background grid is now a preference (`board.grid`): dots
(the default), lines, graph paper (a strong line every 2-12 cells over fainter
ones, like Japanese section paper) or none, with spacing (4-512), mark size and
contrast. Preferences gets a Board grid section; right-clicking an empty board
offers Board grid settings. Zoomed out the grid still thins out (by halves, or
down to graph paper's strong lines), and dots no longer shrink to a single
pixel, so the grid stays visible at low zoom.
The renderer draws lines as well as dots, with a configurable strong-mark
rhythm; a crossing of two lines is blended once, in the stronger colour. A
hand-edited preferences file falls back to the default grid instead of losing
the other preferences.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FEkCVd8n1eC6xTHebmHMDR
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