fix(settings-sync): exclude enterForNewline from cross-device sync

.changeset/settings-sync.md

@@ -0,0 +1,5 @@
+---
+default: patch
+---
+
+Exclude enterForNewline from cross-device settings sync.

src/app/utils/settingsSync.ts

@@ -16,6 +16,8 @@ export const NON_SYNCABLE_KEYS = new Set<keyof Settings>([
   'memberSortFilterIndex',
   // Developer / diagnostic
   'developerTools',
+  // Input behaviour — mobile disables enter-for-newline; syncing would override that
+  'enterForNewline',
   // Sync toggle itself must never be uploaded (it's device-local)
   'settingsSyncEnabled',
 ]);