What

When a user places an embossed text label in a grid cell, then later disables that cell via partial bins, the label geometry remains in the STL output with no wall or floor beneath it. The extrusion floats in space.

Pre-existing limitation exposed by the partial bins feature (#106, PR #112).

Acceptance criteria

• Text labels positioned within a disabled partial-bins cell are excluded from STL generation
• 3D preview reflects the exclusion (no floating labels visible)
• Labels in enabled cells are unaffected