fix(render): repaint on layer/property edits (#231)

Layer color/linetype/lineweight and MATCHPROP edits set the
document dirty flag but never bumped geometry_epoch. The wire
caches key on that epoch and bake a ByLayer entity's resolved
color at tessellation time, so they returned stale wires until
a new entity forced a rebuild. Bump geometry on those four
handlers so the edit repaints immediately.

Also remove REGEN/REGENALL/REDRAW/REDRWALL: the GPU raster
pipeline keeps the display continuously in sync, so on-demand
regen/redraw is a no-op concept in OCS.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

COMMANDS.md

@@ -243,8 +243,6 @@ Status of every standard CAD command in Open CAD Studio:
 | `ZOOM` | Z | Zoom | ✅ |
 | `PAN` | P | Pan | ✅ |
 | `ORBIT` | 3DO | 3D orbit | ✅ |
-| `REGEN` | RE | Regenerate drawing | ✅ |
-| `REDRAW` | R | Redraw viewport | ✅ |
 | `VPORTS` | — | Viewport configuration | ✅ |
 | `VPJOIN` | — | Join viewports | ✅ |
 | `SYNCPVIEWPORTS` | VPSYNC | Sync viewport display settings | ✅ |