test: a failing e2e test leaves no fixture switch or send screen behind (closes #318)

A test that turns a fixture switch on for itself alone turns it off in a
finally, so a failure no longer reddens the tests after it. The two tests
that drive the popup's own send also return it to the address screen,
reopening the popup to leave a wait for a receipt. The lying-decimals()
test asserts that nothing was broadcast as soon as the send ends, before
waiting for the failure screen. ethCallResult() answers an override of 0
instead of falling back to the explorer's scale.

Model: opus-5-5

TODO.md

@@ -45,6 +45,18 @@ but the review is broader than any of them.
 
 # Completed Steps
 
+- 2026-10-05: A Chrome end-to-end test that fails no longer takes later tests
+  down with it ([#318](https://git.eeqj.de/sneak/AutistMask/issues/318)). Each
+  test that turns a fixture switch on for itself alone (a held or failing gas
+  estimate, a seeded native transfer or receipt, a token's lying `decimals()` or
+  markup symbol) turns it off again in a `finally`, and the two tests that drive
+  the popup's own send end on the address screen whether they pass or not,
+  reopening the popup to leave a wait for a receipt. The lying-`decimals()` test
+  checks that nothing was broadcast as soon as the send ends, before it waits
+  for the failure screen, so a broadcast fails it in seconds rather than after a
+  60-second wait. The fixture's `decimals()` override tells 0 from no override,
+  so a token with no decimal places can be fixtured.
+
 - 2026-10-05: A prompt raised while another approval window has focus opens a
   window of its own ([#290](https://git.eeqj.de/sneak/AutistMask/issues/290)).
   The background centred each approval window on the last focused window, which