fix: say a contract creation has no recipient instead of a blank line (closes #250)

A transaction with no `to` showed a blank address, with a colour dot whose
colour was `undefined`, on the wait, success and error screens, the
transaction detail view and the history rows on Home, AddressDetail and
AddressToken. The approval screen showed "(contract creation)".

All of them now say "This transaction creates a new contract. It has no
recipient." The three history lists draw a row's counterparty lines through
one helper in helpers.js. A transaction with a real `to` is unchanged. The
new test drives each screen and list both ways.

Model: opus-5-5

TODO.md

@@ -45,6 +45,14 @@ but the review is broader than any of them.
 
 # Completed Steps
 
+- 2026-10-04: A transaction with no `to` says "This transaction creates a new
+  contract. It has no recipient." on its recipient line and in its transaction
+  history row ([#250](https://git.eeqj.de/sneak/AutistMask/issues/250)). The
+  wait, success and error screens, the transaction detail view and the history
+  rows on Home, AddressDetail and AddressToken showed a blank address there,
+  with a colour dot whose colour was `undefined`; the approval screen showed
+  "(contract creation)". A transaction with a real `to` is unchanged.
+
 - 2026-10-04: The flash line keeps to the one line it reserves at any message
   length ([#252](https://git.eeqj.de/sneak/AutistMask/issues/252)). A message
   that wrapped pushed the whole screen below it down. `#flash-msg` no longer