Fix: AddPictureFromBytes fails on SVG (image: unknown format)

[pegasscience-cyber]

Summary

This patch fixes a regression where AddPictureFromBytes() fails to insert .svg images with the error:
image: unknown format

The issue occurs because the standard Go image library does not support SVG, and the previous implementation always called image.DecodeConfig for every image type.

This change adds SVG-specific handling to bypass raster decoding and derive dimensions directly from the SVG metadata.

[xuri]

Thanks for your PR. I reverted changes for SVG image parser, and update TIF file for fix generated TestSetSheetBackgroundFromBytes.xlsx can not open in Office 2007 based on your branch.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.34%. Comparing base (78a8a43) to head (b1a930e).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2232   +/-   ##
=======================================
  Coverage   99.34%   99.34%           
=======================================
  Files          32       32           
  Lines       25599    25599           
=======================================
  Hits        25432    25432           
  Misses         89       89           
  Partials       78       78           

Flag	Coverage Δ
unittests	99.34% <ø> (ø)

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