harden: lost-password confirmation refuses empty input and ignores invisible characters (closes #336)

A wallet named only with spaces compared equal to an empty field, so
typing nothing would have deleted it, and a zero-width space in a name
made the name impossible to type back.

An empty typed confirmation is now refused whatever the name is. The
characters src/shared/symbolSpoof.js already defines as painting nothing
are removed from both sides before comparing. A name that shows nothing
at all is shown on the delete screens as "Wallet N", so it can still be
typed back.

Model: opus-5-5

TODO.md

@@ -45,6 +45,15 @@ but the review is broader than any of them.
 
 # Completed Steps
 
+- 2026-10-05: The lost-password delete confirmation refuses an empty field and
+  ignores characters that paint nothing
+  ([#336](https://git.eeqj.de/sneak/AutistMask/issues/336)). A wallet named only
+  with spaces compared equal to an empty field, so typing nothing would have
+  deleted it, and a zero-width space in a name made the name impossible to type
+  back. An empty field is now refused whatever the name is, the same invisible
+  characters `src/shared/symbolSpoof.js` strips are removed from both sides, and
+  a name that shows nothing is shown and typed back as "Wallet N".
+
 - 2026-10-05: A `holders_count` that is not a whole number in plain digits is
   unknown, not read in part
   ([#251](https://git.eeqj.de/sneak/AutistMask/issues/251)). `parseInt` read