feat: strengthen modeling, configuration, and assembly workflows

Preserve linked sketch identities through deterministic face projection and resizing. Fix origin-corner picking, persistent inline navigation, appearance editing, configuration styles, component properties, contact sweeps, sheet exports, analytic STEP offsets, and bounded rolling-ball fit accuracy.

Validated with full cargo xtask ci, native workflow screenshots, repeated enclosure replays, and analytic geometry regressions.

docs/book/src/guide/assemblies.md

@@ -20,3 +20,12 @@ couples two joints. Contact sets stop motion where bodies would pass through eac
 volumes in red.
 
 STEP export writes the component tree as an assembly.
+
+Right-click a component in the Browser and choose **Properties** to inspect
+material-aware mass, volume, surface area, centre of mass and world bounds. Descendants and
+repeated instances contribute to assembly totals; pending moves are included. A component
+uses its first placement; `occurrence.properties` selects a specific instance. Root Properties
+measures the complete assembly. Volumes are summed, including overlapping bodies, rather than
+measuring their union. The same workflow is available through `component.properties` and
+`occurrence.properties`; see
+[placement and measurement details](https://github.com/bherbruck/solvecraft/blob/main/docs/assembly-properties.md).

docs/book/src/guide/parameters.md

@@ -18,4 +18,8 @@ existing geometry.
 
 Parameters export to and import from CSV or JSON (`parameters.export`, `parameters.import`).
 **Configurations** (`config.*`) keep a table of rows, each with its own parameter values and
-suppressed features, switched with `config.activate`.
+suppressed features, physical materials and body appearances, switched with `config.activate`.
+The table's Library picker selects material or appearance values. Choose **Follow material**
+to clear an appearance override. Custom looks retain their colour and opacity across
+activation, undo and save/reopen. See
+[configuration commands and examples](https://github.com/bherbruck/solvecraft/blob/main/docs/configurations.md).

docs/book/src/guide/sheet-metal.md

@@ -9,7 +9,22 @@ The SHEET METAL tab builds parts from a sheet of constant thickness under a **sh
 - **Unfold / Refold** (`sheet.unfold`, `sheet.refold`) for working on the flat part.
 - **Convert** (`sheet.convert`) turns a solid of constant thickness into sheet metal.
 - **Create Flat Pattern** (`sheet.flat_pattern`) shows the flat part with its bend lines and a
-  bend table, and exports it as DXF.
+  bend table, and exports it as DXF or a bend-table CSV through the save picker.
 
 Bends follow the rule's K-factor, so flat lengths match what a press brake will make. The
 oracle checks these against parts built in Fusion.
+
+For a shop drawing or spreadsheet, `sheet.export_bend_table` returns CSV by default; choose
+`format: "json"` for structured data. It includes the sheet rule, thickness, bend angles,
+radii, allowances and flat centre-line coordinates. Lengths use millimetres and angles use
+degrees. Supply `path` to save it, or omit `path` to receive the content through the command
+response. `body` defaults to the last sheet body. Exporting does not add a timeline entry or
+consume an undo step.
+
+```json
+{"command":"sheet.export_bend_table","params":{"format":"csv","path":"bracket-bends.csv"}}
+{"command":"sheet.export_dxf","params":{"path":"bracket-flat.dxf"}}
+```
+
+DXF cutout geometry preserves lines, circles and circular arcs; other curves are sampled
+adaptively. The `OUTLINE`, `BEND_UP` and `BEND_DOWN` layers separate cuts from bend centres.