test: load the popup's libraries once per test file, not on every boot (closes #428)

Every popup boot in the tests resets jest's module registry so that src/
loads fresh, and that also reloaded ethers, libsodium-wrappers-sumo, qrcode
and ethereum-blockies-base64 each time. tests/support/popupBoot.js now loads
those four once per test file and registers them once with jest.doMock(),
which jest.resetModules() keeps, so every boot gets the same copies. No test
or assertion changed. make test takes 8-13s on the shared build host, down
from 17-25s, measured in alternating runs before and after the change.

Model: opus-5-5

TODO.md

@@ -45,6 +45,15 @@ but the review is broader than any of them.
 
 # Completed Steps
 
+- 2026-10-04: `make test` takes 8-13s on the shared build host, down from
+  17-25s, measured in alternating runs before and after the change
+  ([#428](https://git.eeqj.de/sneak/AutistMask/issues/428)). Each popup boot in
+  the tests (`tests/support/popupBoot.js`) resets jest's module registry so that
+  everything under `src/` loads fresh, and that also reloaded `ethers`,
+  `libsodium-wrappers-sumo`, `qrcode` and `ethereum-blockies-base64` every time.
+  Those four libraries are now loaded once per test file and handed to every
+  boot. No test or assertion changed.
+
 - 2026-10-04: A token whose scale is unknown reads the same on the Send screen
   as on the confirmation screen
   ([#377](https://git.eeqj.de/sneak/AutistMask/issues/377)). When two addresses'