chore: the native token's label follows the network (closes #372)

networks.js gives each network a nativeCurrency (ETH, SepoliaETH) and nothing
read it: every screen wrote ETH. The wallet's balances and the Send and
confirmation screens now use the active network's. A transaction's figures use
the network its chain id names, through nativeCurrencyByChainId(): the
approval value and fee, the wait, success and error screens, history entries,
the detail screen and the fee-limit refusal, so a site switching networks
cannot make one read as another network's coin. The "ETH" that selectedToken
and txInfo.token hold is the native token's id and is unchanged. A token
reporting any network's nativeCurrency is a spoof, and the detail screen calls
an entry a token transfer when it has a token contract.

Model: opus-5-5

TODO.md

@@ -45,6 +45,18 @@ but the review is broader than any of them.
 
 # Completed Steps
 
+- 2026-10-04: The native token's label follows the network
+  ([#372](https://git.eeqj.de/sneak/AutistMask/issues/372)). `networks.js` gives
+  each network a `nativeCurrency` and nothing read it: every screen wrote `ETH`,
+  so on Sepolia the balance, the value and the fee all read `ETH`. Every native
+  figure now reads `nativeCurrency`, which is `ETH` on mainnet and `SepoliaETH`
+  on Sepolia: the balance lists, Send and confirmation screens and the
+  contract-recipient warning the active network's; the approval, wait, success,
+  error and transaction detail screens, the transaction history and the refusal
+  of a fee above the limit that of the network the transaction's chain id names.
+  A token claiming any network's `nativeCurrency` is dropped as a fake, as one
+  claiming `ETH` already was, and the transaction detail screen calls an entry a
+  token transfer when it has a token contract, not by its symbol.
 - 2026-10-04: A popup that is already open when the stored profile becomes
   unreadable moves to the recovery screen
   ([#373](https://git.eeqj.de/sneak/AutistMask/issues/373)). It used to stay on