The edge swipe-back armed on the first finger and fired on release even when a
second finger had joined (a pinch-zoom — the board is not .zoomed yet at the first
touch, so the hit-test could not skip it). Track the live pointer count in the
capture phase and cancel the swipe the moment a second pointer joins; the back
navigation fires only for a lone finger. Synthetic-PointerEvent e2e covers both.
On login the UI no longer overrides the interface language from the account's
preferred_language. The live interface follows the device — the explicit local
choice (saved, locked) or the system-language guess — so opening the mini-app via
the ru-bot on an English system keeps the interface English (it was forced to
Russian by the account seed). preferred_language is still written from Settings and
used for out-of-app push routing; it just no longer dictates the UI on launch.
Ilia Denisov