Fit in the tile tab left the board small in the middle of the tab. It used frameBoxes, which never zooms past 1 so that two graph nodes do not blow up to fill the screen. The tile board is measured in image pixels, though, and with 16 px tiles it is only about 345 x 186 px. - frameBoxes takes a new cap parameter, default 1. The graph and the node board keep their behaviour. - The tile tab passes its zoom limit of 6, so Fit fills the tab up to 600 percent. - TileCanvas remembers whether the view is still the one Fit set. While it is, a change in the size of the tab or of the board fits again. After a pan or zoom by hand the view stays until Fit. Found on the way: switching the image to another tile size (48 to 16 px) kept the old zoom, and the board shrank to a third. The refit above covers that too. Tests: - ./check.sh: 161 files, 2370 tests, CHECK EXIT 0 (was 2369). - New unit test in graph-framing: with a raised cap Fit fills the view up to the limit. The graph test for "not past 100 %" holds. - e2e 39: ALL PASSED, 31 checks (was 29). Fit fills the tab at 48 px (zoom 0.41) and fits again after the switch to 16 px (zoom 1.24). - Counter probes: a cap of 1 and no refit on a new board size each fail exactly the 16 px check (zoom 1 and zoom 0.41). - e2e sum in the README is 1384, computed, not yet seen in CI. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>