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

src/popup/views/txStatus.js

@@ -4,6 +4,7 @@ const {
     $,
     showView,
     addressTitle,
+    CONTRACT_CREATION_TEXT,
     escapeHtml,
     renderAddressHtml,
     attachCopyHandlers,
@@ -58,7 +59,10 @@ function endWait() {
     }
 }
 
+// A contract creation reaches these screens with `to` as "" (approval.js
+// writes `to: toAddr || ""`).
 function toAddressHtml(address) {
+    if (!address) return escapeHtml(CONTRACT_CREATION_TEXT);
     const title = addressTitle(address, state.wallets);
     return renderAddressHtml(address, { title });
 }
@@ -202,8 +206,9 @@ function restoreWait() {
     if (!info || typeof info !== "object" || Array.isArray(info)) return false;
     // A string is the whole requirement: the empty string is what a
     // contract-deployment approval persists (approval.js writes `to: toAddr
-    // || ""`), and both fields render harmlessly when empty, so refusing it
-    // would abandon a wait the live path itself created.
+    // || ""`), an empty `to` renders as a contract creation and an empty
+    // amount renders harmlessly, so refusing it would abandon a wait the live
+    // path itself created.
     if (typeof info.to !== "string") return false;
     if (typeof info.amount !== "string") return false;
     if (typeof w.broadcastTime !== "number" || !isFinite(w.broadcastTime)) {