Merge commit '69220ea'

style: Restore fixed-layout properties for Kindle rendering

Fix trailing indent in PanelViewEPUBConverter

Fix PanelViewEPUBConverter syntax formatting errors

Fix Kindle E013 and blank pages: Revert to implicit layout matching Evangelion baseline

Fix CI build errors: parameter mismatches and variable scoping

Fix Kindle 5.19.2 E013 mapping bug and edge-to-edge white margins

fix(export): restore 100% viewport CSS bounding boxes to fix cover overflow on iPad and inject missing landmarks block into nav.xhtml to pass Amazon EPUB3 structural checks

fix(export): enforce absolute pixel layout dimensions (1000px by 1500px) and valid EPUB3 nav links in generated chunks to bypass Kindle E013 margin constraints

fix(export): dynamically resolve OPF cover manifest IDs and attach EPUB3 cover-image properties to prevent Amazon E013 validation failure

fix(export): Restore Amazon Fixed-Layout tags to standard exports so they pass cloud validation and bypass FW 5.19.2 margins

fix(epub): Rewrite export layout engine to strictly adhere to Amazon Fixed-Layout specs, defining mandatory book-type=comic, pre-paginated layouts, and absolute viewport positioning to bypass FW 5.19.2 border injection

fix(epub): Remove explicit styling constraints wrapper inside XHTML generation to match exact empty-body parsing native to bare reflowable EPUB specs

fix(epub): Remove toc.ncx explicitly from engine and inline CSS into every Chunk to enforce cover-like layout consistency and stop E013 fallback

fix(compile): Define mangaMode missing property in ConversionOptions and explicitly declare utf8 strings to satisfy SwiftUI compiler