Trailcode/sketch list improvements

[trailcode]

PR - Trailcode/sketch_list_improvements

Title

Sketch list dimension controls and dimension arrow-size settings

Issue

#100

Summary

• Add expandable sketch inspector sections in Sketch List for dimensions, edges, and faces.
• Add per-dimension controls in Sketch List: visibility checkbox and numeric offset input (flyout distance).
• Persist per-dimension visibility/offset in sketch JSON with backward-compatible loading for legacy arrays.
• Add a new Settings -> Sketch control for dimension arrow size, persist it in GUI settings JSON, and apply it live.
• Apply global arrow-size setting to sketch dimensions and extrude preview dimensions.

Files Changed

• src/geom.cpp
• src/geom.h
• src/gui.cpp
• src/gui.h
• src/gui_settings.cpp
• src/occt_view.cpp
• src/occt_view.h
• src/shp_extrude.cpp
• src/sketch.cpp
• src/sketch.h
• src/sketch_json.cpp

Related

• Compare: main...Trailcode/sketch_list_improvements
• Issue draft: issue.md

Test Plan

• Build EzyCad_lib in Release config.
• Open Sketch List and verify per-sketch expand/collapse works.
• Expand Dimensions and verify each row has visibility and offset controls.
• Set offset to non-zero and verify label flyout distance updates.
• Set offset to 0 and verify automatic flyout behavior is restored.
• Save and reopen project; verify per-dimension visibility/offset persist.
• Open Settings -> Sketch; adjust Dimension arrow size and verify existing dimensions update live.
• Verify extrude preview dimension arrow size follows the same setting.