test: drive WaitTx's timeout and failed-lookup exits end to end (closes #315)

Two Chrome end-to-end cases send ETH and leave the wait for its receipt
running. In one, lookups answer "no receipt" until the 60-second deadline
ends the wait with the timeout message. In the other, a new fixture switch
makes every receipt lookup fail, and the sixth failure in a row ends the
wait with the message naming the unreachable network. Both check the exact
message and that Done returns to the address screen. Both wait in real
time: Playwright's clock would apply to every later test, and backdating
the stored broadcast time races the popup's own save.

Model: opus-5-5

TODO.md

@@ -45,6 +45,16 @@ but the review is broader than any of them.
 
 # Completed Steps
 
+- 2026-10-05: The Chrome end-to-end suite drives both ways the wait for a
+  transaction's receipt ends on the error screen
+  ([#315](https://git.eeqj.de/sneak/AutistMask/issues/315)): lookups that still
+  find no receipt 60 seconds after the broadcast end it with the timeout
+  message, and six lookups that fail in a row end it with the message naming the
+  unreachable network. Done then returns to the address screen. Both cases wait
+  in real time, about a minute each. Playwright's clock would apply to every
+  later test in the run and cannot be removed, and moving the stored broadcast
+  time back can be undone by the save the popup makes every ten seconds.
+
 - 2026-10-05: The Chrome end-to-end suite covers the last of the
   [#150](https://git.eeqj.de/sneak/AutistMask/issues/150) and
   [#151](https://git.eeqj.de/sneak/AutistMask/issues/151) items