# PPTX Import Fidelity Fix - alpha36-fix6

## Purpose

This fix improves visual fidelity for imported PowerPoint slides that combine Japanese vertical text, rotated helper shapes, theme-based grey connector shapes, and nested groups.

## Changes

- Uses center-origin Fabric placement for rotated PPTX shapes/images/text so rotation behaves closer to PowerPoint.
- Applies DrawingML luminance transforms (`lumMod`, `lumOff`, `shade`, `tint`) for theme/scheme colors.
- Imports group shapes by direct recursive traversal rather than a flat descendant scan, preserving child z-order more accurately.
- Keeps the previous vertical Japanese text glyph fallback, Fabric text style normalization, and lazy image materialization fixes.
- Updates the PPTX importer profile to `alpha36-fix6`.

## Notes

The current importer still uses editable Fabric approximation. Full PowerPoint-fidelity rendering will require the later OOXML native shape/text pipeline and round-trip preservation model.