Mobile POS beta14 — keep your place while adding items

Fix: adding an item no longer jumps the product list back to the top.

The item grid now stays in place when the basket updates. Verified with repeated additions near the bottom of both the full catalogue and Favourites. Search, category and favourite-filter changes continue to refresh results.

Verified: 80 unit tests, 41 browser tests, typecheck, formatting, attribution and Android ARM64 release build. Please confirm the fix on your phone.

Install this APK over your existing beta. Includes the beta13 server-selection improvements. Android app only; no desktop installer.