Fix bookmark restore landing at wrong position when zoom differs

[Copilot]

Restoring a manual bookmark doesn't reproduce the saved view. The focus and scale come back different from what was bookmarked, which shows up when navigating nested groups by zooming.

Change in Group::gotoBookmark_b (model/group.cc)

• A bookmark stores the group origin position (x, y) at the saved zoom level.
• The old code called moveTo(b.x, b.y) and then zoom(x(), y(), ...). The zoom scales contents about the group origin, so the saved offset was distorted whenever the current zoom differed from the saved one.
• The new code zooms first, then moves, so the group lands exactly at the saved position:

zoom(x(), y(), b.zoom/(relZoom*zoomFactor()));
moveTo(b.x, b.y);

Not verified

• I haven't built this or run any tests. I also haven't tried it on the attached mmt.mky model.
• Group::zoom only propagates to child groups when displayContents() is true and its state didn't just change. A bookmark that crosses that display threshold may still restore slightly off. That would be a separate cause and isn't addressed here.

• Fixes [SF#1402] Manual bookmarking not saving exact location #803

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[highperformancecoder]

Decided this was not an issue.