fix: a token symbol read off a contract is never stored cut mid-emoji (closes #458)

lookupTokenInfo() cut the symbol at 12 and the name at 64 UTF-16 units,
so an emoji outside the Basic Multilingual Plane could be cut between its
two halves and the half left over stored and shown as U+FFFD. Both are
now cut on code points, as displaySymbol() does. A symbol already stored
broken is not repaired.

Model: opus-5-5

TODO.md

@@ -45,6 +45,15 @@ but the review is broader than any of them.
 
 # Completed Steps
 
+- 2026-10-06: A token symbol or name read off a contract is no longer stored cut
+  between the two halves of an emoji
+  ([#458](https://git.eeqj.de/sneak/AutistMask/issues/458)). `lookupTokenInfo()`
+  cut both by UTF-16 units; it now counts code points, as `displaySymbol()` has
+  since [#329](https://git.eeqj.de/sneak/AutistMask/issues/329).
+  `tests/tokenLookupTruncation.test.js` looks up a token whose symbol and name
+  are made of emoji outside the Basic Multilingual Plane. A symbol already
+  stored broken is not repaired.
+
 - 2026-10-06: Reloading or closing the popup no longer logs a request it cancels
   as a failure in the transaction lists and ENS name lookups on the address and
   token screens, the address scan after a wallet is created, the endpoint checks