fix(document): apply rotation transform to document annotation layers

[kduncanhsu]

Summary

• Apply rotation transforms to annotation layers in DocumentAnnotator.renderPage(), mirroring the ImageAnnotator pattern
• When rotation is non-zero, layers are sized to original (unrotated) page dimensions, centered via translate(-50%, -50%), and rotated to stay anchored to the rotated page content
• When rotation returns to 0°, inline styles are cleared to restore default SCSS positioning

Companion PR

• box-content-preview: includes rotationAngle in scale events so the rotation state reaches the annotations store (Link: fix(doc): improve PDF rotation behavior for annotations box-content-preview#1638)

Test plan

• Verify annotations (highlight, region, draw, comment pin) stay anchored to page content at 0°, 90°, 180°, 270°
• Verify annotations display correctly when rotating back to 0°
• Verify no visual regression for annotations on non-rotated documents

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