fix: Back from Settings no longer lands on a delete wallet screen left by the gear (closes #480)

Leaving the delete wallet or lost-password screen drops its wallet
selection, but the settings gear had just pushed the screen onto the Back
stack, so Back from Settings showed a screen whose button could only
answer "No wallet selected for deletion." Each screen's leave handler now
also takes it off the top of the stack, as the private key export and
recovery phrase screens do since
#461. Back from Settings then
stays on Settings once, as it does for the recovery phrase screen.

Jest tests drive the gear and then Back on both screens, and the delete
screen's own Back.

Model: opus-5-5

TODO.md

@@ -45,6 +45,15 @@ but the review is broader than any of them.
 
 # Completed Steps
 
+- 2026-10-06: Back from Settings no longer lands on the delete wallet or
+  lost-password screen after either was left by the settings gear
+  ([#480](https://git.eeqj.de/sneak/AutistMask/issues/480)), the defect
+  [#461](https://git.eeqj.de/sneak/AutistMask/issues/461) fixed for the two
+  secret screens. Leaving drops the screen's wallet selection, so its leave
+  handler now also takes it off the Back stack, as a reopened popup already
+  does. `tests/deleteWalletLostPassword.test.js` drives the gear and then Back
+  on both screens.
+
 - 2026-10-06: Back from Settings no longer lands on the private key export or
   recovery phrase screen after either was left by the settings gear
   ([#461](https://git.eeqj.de/sneak/AutistMask/issues/461)). Leaving drops the