Qr code button hide from debug screen.
Qr code button also keep hidden for now , after complete multiple viewer join will enable it.

and the bridge when a swap entry is present.

moveDirIfExists refused to proceed whenever the destination files existed,
even if there was nothing in ColdDataDir to move. After the first run the
node creates stateproof.sqlite and crash.sqlite in HotDataDir, so every
subsequent startup with separate hot and cold dirs failed with
"destination file ... already exists, not overwriting".

Return early when none of the files exist in the source directory, and add
a regression test for the restart case.

Size against offset only catches a truncation that is still visible when
the poll arrives. A file emptied and written back past the old offset
inside one interval never looks short, and the next drain reads new bytes
at a stale position: the prefix is lost and a pending fragment of the old
file is spliced onto what followed.

Polling has no way to close that. Nothing separates a truncate-and-regrow
from an append once the inode is unchanged and the length has recovered,
so the alternative is a different mechanism rather than a better check.
The window is one interval wide, algod rotates by renaming, and tail -F
has the same hole; it is left open on purpose, and now says so.

The truncation test slept to stay out of that window without explaining
which window, which read as timing noise rather than as the point.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PqPSx1wqM8rMdo4EHPa4jy