new tools, fixes

Fixed the in-tool operators toolbar drift in core/src/main/kotlin/com/github/alfu32/sketch/ui/SketchUiOverlay.kt.

The issue was that rebuilding the toolbar repacked the window after tool changes while preserving the bottom-left position, so tiny height differences moved the top edge. The rebuild now captures the previous top edge and restores the window after pack().

• Built-in tool palette commands are now generated from the actual ToolController registered tools instead of a hand-maintained list.
  • This catches tools that were missing from Ctrl-Shift-P, including newer/mechanical/boolean/object tools as long as they are registered in the controller.
  • Excluded only ToolId.PLUGIN, since plugin tools already register their own palette commands.
  • Increased the default blank-palette command cap from 20 to 200, so opening Ctrl-Shift-P without typing no longer hides most commands.
  • Added better searchable tags from both displayName and ToolId words.

Implemented the two 3D sweep variants.

Added:

• Ribbon 3D
  • Uses the existing double_line icon.
  • Uses PolylineSettings.doubleLineSize and doubleLineOffset.
  • Draws a constant-width planar ribbon along a 3D polyline.
  • Builds one cross-section per path point and connects them as mesh faces.
  • Uses miter-style section normals and parallel transport to reduce twist.
• Extrude Swipe 3D
  • Uses the existing swipe_surface icon, same as Extrude Swipe.
  • Uses selected line segments as the profile.
  • Draws a 3D swipe path.
  • Projects the profile into the first section, builds compatible sections at path vertices, and connects corresponding profile vertices so adjacent spans meet.

Added shared support:

• Sweep3dSupport.kt
  • path section frames
  • miter/bisector normals at internal path points
  • parallel-transport frame propagation
  • profile projection and section point generation

Wired into:

• ToolId
• Main
• toolbar layout
• command palette registration
• tool cycling for Extrude Swipe 3D
• docs reference