fix(tablet): preserve sizing for non-Pen tablet tools

[devmobasa]

Summary

Fixes #330 by applying pressure-based thickness only to catalog-declared pressure-sensitive Pen strokes.

• Preserve the selected size for Marker, Textmarker, and Step Marker
• Ignore tablet pressure when the active tool does not support pressure thickness
• Document that pressure-to-thickness applies only to freehand Pen strokes
• Align configurator search terms with the updated Tablet subtitle
• Add regressions for non-Pen tool sizes, pressure capability, and configurator search