Shape local frame: axes / plane / up and face-based set

[trailcode]

Summary

• Per-solid local XYZ frame UI: Shape List Show axes / Show plane / Show up, Reset frame to bbox, Set from planar/cylindrical face..., Flip up / Flip axis (Z).
• AIS triad (X red, Y green, Z blue), plane, and up annotations; suppressed in sketch modes; frameDisplay persisted in .ezy.
• Mode::Shape_set_frame (Shape List only, no toolbar/hotkey); planar origin = face area centroid; cylindrical origin = solid center projected onto the axis; undo via frame-only Shape_geom_delta.

Test plan

• Build Release EzyCad
• Shape List solid: toggle Show axes / Show plane / Show up; annotations appear and hide in a sketch mode
• Reset frame to bbox recenters world-aligned frame and turns axes on
• Set from planar face... on a circular end face puts origin at the circle center; Z along normal
• Set from cylindrical face... aligns Z to the cylinder axis
• Flip up / Flip axis (Z) and undo restore prior frame
• Save/reload .ezy keeps frameDisplay flags
• Spot-check docs/usage.md, src/doc/shape.md / gui.md, CHANGELOG

Closes #251

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Note

Medium Risk
New interactive mode, OCCT AIS lifecycle, and project JSON fields affect viewer stability and undo; scope is modeling UI rather than security-critical paths.

Overview
Adds Shape List workflows to view and edit each solid’s local gp_Ax3 frame: toggle Show axes / Show plane / Show up, Reset frame to bbox, Flip up / Flip axis (Z), and Set from planar/cylindrical face... (new Mode::Shape_set_frame + Shp_set_frame, no toolbar hotkey).

Shp now builds optional AIS overlays (RGB triad, cyan plane, green up arrow), keeps them in sync with transforms and effective visibility (sketch modes, Hide all, hidden groups), and tears them down on remove/load/shutdown. Display toggles persist in .ezy as frameDisplay; frame edits use undoable Occt_view::set_shape_frame (Shape_geom_delta). Undo/redo maps Shape_set_frame back to Normal like other pick/drag tools.

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