fix(popup): portal annotation popup toolbar and reply so it stays upright on rotate

[kduncanhsu]

Summary

• Portal PopupDrawingToolbar and PopupReply to the popupPortalEl container (outside the rotating .ba-Layer) so they remain upright when the page is rotated, matching the existing PopupV2 approach
• Fix PopupDrawingToolbar Popper.js options so the toolbar correctly follows its annotation on scroll and doesn't stick to the viewport edge
• Prevent DeselectListener from deselecting annotations when clicking portaled popup elements

Details

When the page is rotated, annotation layers receive transform: rotate(Xdeg), causing all children to rotate. PopupV2 already solved this via portaling, but PopupDrawingToolbar and PopupReply still rotated with their layers.

Portaling changes:

• Pass popupPortalEl through DrawingManager → DrawingAnnotationsContainer → DrawingAnnotations for both DocumentAnnotator and ImageAnnotator
• Wrap PopupDrawingToolbar and PopupReply in ReactDOM.createPortal() targeting popupPortalEl
• Return null if popupPortalEl is unavailable (no fallback to inline rendering)

Stacking context fix:

• Add position: relative; z-index: 10; pointer-events: none to .ba-PopupPortal so portaled popups render above the drawing layer's full-page click overlay
• Set pointer-events: auto on .ba-Popup children so they receive clicks

Popper.js behavioral fixes:

• Remove scroll: false from eventListeners modifier — now that the toolbar is outside the scroll container, Popper must actively reposition on scroll
• Remove altAxis: true from preventOverflow — this was clamping the toolbar to the viewport edge vertically instead of letting it scroll away with the annotation

Deselect fix:

• Add .ba-Popup to the DeselectListener closest-check so clicks on portaled popups don't trigger annotation deselection

Test plan

• Unit tests pass (160 tests across 9 suites)
• Rotate a PDF 90/180/270°, enter drawing mode, draw a shape — toolbar stays upright and positioned near the drawing
• Click "Add Comment" — reply popup stays upright
• Scroll while toolbar is visible — toolbar follows the annotation and disappears off-screen with it
• Test the same on images (not just PDFs)
• Click outside a popup — annotation correctly deselects
• Click popup buttons (undo/redo/delete/Add Comment) — all register correctly

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