User-triggered 120x120 = 14400 cells, which produces huge STL/long
renders. Total cells is the right metric (CSG cost scales with count,
not max axis), so cap by N = rows*cols (or rows*(rows+1)/2 for tria
style). 1000 covers any realistic pack (e.g. 20x50) while blocking
accidental misuse.
Backend:
- holder.py: MAX_CELLS env-tunable (default 1000); expected_cell_count
and _check_cell_limit raise ValueError on exceed; both
compute_cells() and render_stl() call it up-front.
- app.py: /api/holder/render now returns 400 on ValueError (not 500)
so the frontend can distinguish bad input from server failure.
/api/holder/params now publishes max_cells alongside the schema.
Frontend:
- holder-app.js: reads max_cells from the params endpoint; status
shows "N cells / over limit (1000)" in red and disables the
Render and "Design busbars" buttons when exceeded.
- holder.css: .topbar-status.over-limit style (red, bold).
wenil
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