test: assert the #150 and #151 items the harness did not cover (closes #188)

Covers the four DoD items #188 scoped: the AddToken quick-pick populating the address field, Back out of AddToken unwinding the persisted navigation stack exactly once, a native ETH transfer rendering in TransactionDetail with no token contract row, and tap-to-copy reading the real clipboard back.

The native path needed a fixture: the Blockscout normal-transactions endpoint answered [] unconditionally, so there was no non-ERC-20 row to open.

Each assertion demonstrated to discriminate by mutation, one break at a time with the pre-existing tests staying green: a double viewStack push, a no-op quick-pick handler, an un-hidden token contract row, the ERC-20 branch forced onto a native transaction, and a dropped clipboard write each turn exactly the corresponding test red and no other.

Four further DoD items from #150 and #151 remain outside this scope and are tracked in #295.

TODO.md

@@ -54,6 +54,22 @@ undefined identifiers, which is how
   stubbed RPC and the unobservable toolbar popup — were checked against the
   current `src/content/inpage.js` and `tests/e2e/` and left as they are
   ([#285](https://git.eeqj.de/sneak/AutistMask/issues/285)).
+- 2026-08-14: The parts of the
+  [#150](https://git.eeqj.de/sneak/AutistMask/issues/150) and
+  [#151](https://git.eeqj.de/sneak/AutistMask/issues/151) definition of done the
+  e2e suite did not cover are asserted. It had only shown that the two screens
+  open without throwing. Now: the Add Token round trip leaves the navigation
+  stack exactly as it found it, read out of extension storage rather than
+  inferred from which screen is up, so an orphaned entry — the second-order
+  damage of #150 — is caught where it happens rather than one Back press later;
+  a common-token quick-pick puts its contract address in the field; the native
+  ETH detail path renders with its own type, value and raw quantity and with the
+  token contract row still hidden, against a new `seedNativeTransfer` fixture,
+  since the normal-transactions endpoint answered `[]` unconditionally and there
+  was no non-ERC-20 row to open; and tapping the token contract address puts it
+  on the real clipboard, read back after a sentinel write. Each of the four was
+  demonstrated failing against a deliberately broken build
+  ([#188](https://git.eeqj.de/sneak/AutistMask/issues/188)).
 - 2026-08-12: EIP-1193 error codes now reach the page. `src/content/inpage.js`
   rebuilt every failure as `new Error(error.message)`, so the code the
   background produced and the content script relayed intact was dropped in the