SettlementTable.test.tsx passes Element where HTMLElement is required at 5 sites — queries are returning a weaker type than the assertions need

[daveedAJ]

src/components/SettlementTable.test.tsx produces 5 TS2345 errors — at lines 72, 269, 270, 271 and 272:

Argument of type 'Element' is not assignable to parameter of type 'HTMLElement'.
Something in the test is producing a plain Element — typically container.querySelector(...), .closest(...), .parentElement, or iterating children — and passing it into an API that requires HTMLElement, such as a @testing-library/jest-dom matcher or a within(...) scope.

The tests pass, because CI never type-checks test files (tracked separately). But the type error is a real signal, and the fix is not a cast.

closes #430