- 2.5D view: a toolbar toggle (plus an options-panel checkbox) re-aims the
orthographic camera at an SE-isometric angle and unlocks orbit, so the
CAD elevation already in the vertex buffers (contours, TIN, 3D
polylines) becomes visible. Nothing is re-tessellated; switching back
restores the locked top view. A Z exaggeration slider (persisted in the
options store) makes kilometre-wide sheets with metres of relief
legible; picking and the X/Y readout intersect the Z=0 plane.
- Viewport fills: SOLID/HATCH fills and dimension arrowheads drawn
through a paper-space VIEWPORT now get the model-to-paper transform
(_fillXf / _bakeFillXf), as lines already did via pushSeg.
- The trimmed content box keeps the drawing's real Z range instead of
collapsing to z=0, so the 2.5D fit and clip slab cover the relief.
- src/topProgress.ts: driver for the existing #progress loading bar. It
is not imported from main.ts yet.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
