feat: password-gated recovery phrase display for HD wallets (closes #161)

TODO.md

@@ -49,6 +49,10 @@ undefined identifiers, which is how
   `src/shared/transactions.js` goes through one case-normalising helper so a
   checksummed genuine contract is no longer read as a spoof
   ([#179](https://git.eeqj.de/sneak/AutistMask/issues/179)).
+- 2026-08-11: Password-gated recovery phrase display for HD wallets, reached
+  from the wallet row in Settings, wiped on leaving the screen and excluded from
+  the views the popup can reopen onto
+  ([#161](https://git.eeqj.de/sneak/AutistMask/issues/161)).
 - 2026-08-11: Policy compliance sweep — conditional verbose test rerun, local
   Tailwind binary instead of `npx`, `--frozen-lockfile` on `make install`, and
   the Makefile-only targets documented in the README