test(e2e): add a weight through the dashboard against the real server

The add-measurement flow answered its own POST and list read, so it proved
that the list renders a row the test typed in. It now runs on the
measurement journey's account, emptied first, and checks that the reading
the server stored is the one entered and that the dashboard tile, the weight
chart's data table and the day view all show it.

src/__tests__/e2e-critical-no-api-stub-guard.test.ts

@@ -49,7 +49,7 @@ const E2E = join(process.cwd(), "e2e");
  * the set is the release gate, so a journey that loses its tag is a change
  * somebody should see here.
  */
-const CRITICAL_TEST_FLOOR = 10;
+const CRITICAL_TEST_FLOOR = 11;
 
 /** A test whose title literal carries the tag, however the call is spelled. */
 const CRITICAL_TEST =