AddedAdded a configurable default PDF zoom setting under Settings > Editor > PDF, including a new Fit width mode that opens PDFs scaled to the current viewport width
AddedAdded a Fit Width toggle to the PDF toolbar, with session-aware PDF tab state so fit-width mode is restored consistently across reopened tabs and history entries
ChangedChanged the default PDF opening zoom from 100% to Fit width, making documents easier to read on larger screens by default
ChangedUpdated the embedded Claude ACP runtime to 0.55.0
ChangedPolished the PDF toolbar with a simpler page counter, refined navigation controls, and a more compact layout in narrow panes
FixedFixed PDF fit-width behavior across resize, reopen, and alternate opening paths so the computed zoom remains stable and explicit zoom actions cleanly leave fit-width mode
FixedFixed Claude runtime model fallback coverage for the updated ACP runtime
