A page that frames PdfCraft on the same origin can now pass it PDFs and
receive saves through postMessage, instead of Save becoming a browser
download. Built for a Nextcloud integration, but nothing in it is
host-specific.
- ui-egui: HostSaveFn/HostDirtyFn hooks (`host_save`, `host_dirty`),
None by default. On wasm, Save hands the bytes to `host_save` when
set; `host_dirty` hears each frame whether any tab has unsaved work.
- pdfcraft-web: `host::Bridge`, enabled only by `?host=parent` inside a
frame. Messages: pdfcraft:ready / open / save / dirty / failed; only
the parent window on our own origin is heard or answered.
`?author=` names comment authors unless the user chose a name.
- Test: host_dirty_hears_when_unsaved_work_appears_and_goes.
Without `?host=parent` nothing changes.
Claude-Session: https://claude.ai/code/session_01G6GtUCaPiCMEQCN4QcdQnp
Co-authored-by: Claude Opus 5.5 <[email protected]>
Co-authored-by: Brandon Thomas <[email protected]>
