* fix: reject oversized checkout diffs
* fix(diff): keep large previews from disconnecting clients
The physical socket limit is an OOM backstop, not a frame-size contract. Bound structured diff construction incrementally and report oversized previews without closing the client's socket.
* fix(app): preserve oversized diff state
* fix(diff): stay within relay frame limit
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Co-authored-by: Mohamed Boudra <boudra.moha@gmail.com>
Open the complete working comparison in a desktop workspace tab while preserving inline sidebar diffs when the tab is closed.
Working and commit comparisons share one diff panel, and workspace layout is the sole owner of live tab persistence and identity.
Refs #1520
