feat: WPS text box

[dolanmiu]

Following up from #3182 as I cannot push to that branch

• Add WPS (WordProcessing Shape) text box support as a modern DrawingML-based alternative to legacy VML text boxes
• Introduce WpsShapeRun for inline/floating text boxes with solid fills, outlines, rotation, and body property controls
• Introduce WpgGroupRun for grouping shapes together
• Refactor Drawing, Inline, Graphic, and GraphicData to handle WPS/WPG graphic types alongside existing picture data
• Add BodyProperties with vertical anchor and margin options, NonVisualShapeProperties, WpsTextBox, and WpsShape components
• Add demo 99 showcasing basic, styled, rotated, floating, and vertically-aligned text boxes

New Public API

• WpsShapeRun — creates a text box run with children (paragraphs), transformation (width/height/rotation), and optional solidFill, outline, floating, bodyProperties
• WpgGroupRun — creates a grouped shape run containing multiple child shapes
• VerticalAnchor enum — TOP, CENTER, BOTTOM for text box vertical alignment

Test plan

• Unit tests for WpsShapeRun (inline, floating, rotation, fill, outline, body properties)
• Unit tests for WpgGroupRun (inline, floating, multiple children)
• Unit tests for BodyProperties (defaults, margins, vertical anchor, noAutoFit)
• Run npm run demo 99 and verify all 5 text boxes render in Word/LibreOffice
• Run npm run demo 94 (legacy VML) to confirm no regressions

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (10bd1f3) to head (2744419).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##            master     #3369    +/-   ##
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  Coverage   100.00%   100.00%            
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  Files          305       313     +8     
  Lines         9510      9748   +238     
  Branches      1517      1557    +40     
==========================================
+ Hits          9510      9748   +238     

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