feat(annotations): support highlight/text annotations on rotated docs

[kduncanhsu]

Summary

• Adds rotation support to highlight annotations by converting screen-coordinate selection rects to element-local coordinates, matching the approach already used by drawing/region annotations
• Portals the highlight promoter popup (PopupHighlight) and error popup (PopupHighlightError) out of the rotated annotation layer so they remain upright and correctly positioned on screen
• Passes containerEl (the textLayer element) through the selection flow so that setSelectionAction can use it with getElementLocalPosition() to convert screen coordinates to element-local coordinates. Previously only
  containerRect (the DOMRect) was passed, which doesn't provide the element reference needed to account for CSS rotation transforms.
• Fixes a bug where overdragging past text (selecting an entire line and dragging slightly beyond) would silently fail on rotated documents because the mouseup event never reached the textLayer

Test plan

• Run npm test — all 965 tests pass
• Open a PDF, rotate -90°, select partial text → popup appears correctly positioned and upright
• Rotate -90°, select an entire line (overdrag past end of text) → popup still appears
• Click the promoter popup → highlight is staged at the correct position within the rotated layer
• Save the highlight → persists correctly and renders properly at 0°, -90°, -180°, -270°
• Verify non-rotated highlight behavior is unchanged (no regressions)

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