PDF: Fix zoom in paginated spread mode and add swipe gestures

[mickael-menu]

Added

Navigator

• Added swipe gesture support for navigating in PDF paginated spread mode.

Deprecated

Navigator

• PDFNavigatorViewController.scalesDocumentToFit is now deprecated and non-functional. The navigator always scales the document to fit the viewport.

Fixed

Navigator

• Fixed zoom-to-fit scaling in PDF paginated spread mode when offsetFirstPage is enabled.

[Copilot]

Pull request overview

This PR enhances the PDF navigator by adding swipe gesture support for navigating in paginated spread mode, deprecating the scalesDocumentToFit property, and fixing zoom-to-fit scaling issues when offsetFirstPage is enabled.

Key Changes

• Added swipe gesture recognizers (left/right) for page navigation in PDF paginated spread mode
• Deprecated scalesDocumentToFit property, making the navigator always scale documents to fit the viewport
• Introduced visiblePagesDidChange notification observer to refresh scale factors when visible pages change in paginated mode

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
Sources/Navigator/PDF/PDFNavigatorViewController.swift	Added swipe gesture support, deprecated scalesDocumentToFit property, refactored zoom-to-fit logic with new updateScaleFactors(zoomToFit:) parameter, and added visible pages change observer
CHANGELOG.md	Documented the new swipe gesture feature, deprecation of scalesDocumentToFit, and the zoom-to-fit scaling fix

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