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

A transaction with no `to` showed a blank recipient line on the wait,
success and error screens and the transaction detail view: an empty
address, with a colour dot whose colour was `undefined`. The approval
screen showed "(contract creation)".

All five now say "This transaction creates a new contract. It has no
recipient." A transaction with a real `to` is unchanged. The new test
drives each screen both ways.

Model: opus-5-5

TODO.md

@@ -45,6 +45,13 @@ 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
+  ([#250](https://git.eeqj.de/sneak/AutistMask/issues/250)). The wait, success
+  and error screens and the transaction detail view showed a blank line 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: A method the wallet does not implement is refused with EIP-1193
   code `4200` ([#279](https://git.eeqj.de/sneak/AutistMask/issues/279)). The
   background's `Unsupported method: <method>` error carried no code, so a site