wallet_switchEthereumChain was answered for any origin at all, with no
connection check and no prompt, so a page the user had never connected to
could move the active chain — clearing the [TESTNET] banner under someone
who believed they were on Sepolia. It now takes the same
allowedSites/connectedSites gate the signing methods take, ahead of the
same-chain and unsupported-chain answers, and refuses an unconnected origin
with 4100.
The switch also overwrote state.rpcUrl and state.blockscoutUrl with the
network defaults, so a user running their own node lost that url
permanently and silently to a public endpoint that then sees every address
they hold. Endpoints are now remembered per network in
state.networkEndpoints: the switch snapshots the network being left and
restores the network being entered, falling back to that network's
defaults. state.rpcUrl and state.blockscoutUrl remain the live endpoints of
the active network, so no reader changed; for the active network they are
authoritative and the map entry may be stale, and the snapshot is what
reconciles them. A profile written before the map existed has its stored
pair adopted for the network it was stored under, so nothing is lost on
first load.
## Summary
Fixes USD prices still showing on the main view when connected to a testnet (e.g. Sepolia). The root cause was stale mainnet prices lingering in the in-memory price cache after switching networks.
### Root Cause
PR #137 correctly made `refreshPrices()` skip fetching on testnets, but the cached prices from a prior mainnet session remained in the `prices` object. All display functions (`getPrice()`, `getAddressValueUsd()`, etc.) used whatever was cached without checking which network was active.
### Changes
- **`src/shared/prices.js`**
- `refreshPrices()` now clears the price cache when on a testnet instead of silently returning
- New `clearPrices()` function empties the cache and resets the fetch timestamp
- `getPrice()` returns null on testnets (defense-in-depth)
- `getAddressValueUsd()`, `getWalletValueUsd()`, `getTotalValueUsd()` return null on testnets
- **`src/popup/views/settings.js`**
- Network switcher immediately clears prices when switching to a testnet, so the UI updates without waiting for the next refresh cycle
closes#139
Co-authored-by: clawbot <clawbot@noreply.git.eeqj.de>
Reviewed-on: #142
Co-authored-by: clawbot <clawbot@noreply.example.org>
Co-committed-by: clawbot <clawbot@noreply.example.org>
