QA re-release: backend 1.1.27, frontend 1.1.70 (new frontend bits)

Same version numbers, NEW frontend image. release-be1.1.27-fe1.1.70 pointed at
digest sha256:5b90e224...; the 1.1.70 tag has since been re-pushed with the
mic/camera chevron menu fix (they reserved a row-count estimate instead of
their real height and opened ~200px above the control bar).

Frontend digest is now
sha256:595d62573c49e8db2dbd3410fb960f7397e2525eb49382c61b18d82115edb94f

The bundle itself is unchanged — same commit, same image tags — so this tag
exists only to keep the two sets of bits distinguishable, per the re-release
rule. A target already reading 1.1.70 must 'docker compose pull frontend';
'up -d' alone will not fetch it.
This tag has no release notes.