feat: restrict the network selector to Ethereum/Base and their testnets

[levalleux-ludo]

What

The network selector currently offers every chain the SDK supports for the
environment — Ethereum, Base, Polygon, Arbitrum and Optimism on production, and
their Sepolia/Amoy counterparts on testing/staging. This restricts it to:

Environment	Chains offered
production	Ethereum (1), Base (8453)
staging	Sepolia (11155111), Base Sepolia (84532)
testing	Sepolia (11155111), Base Sepolia (84532)
local	Local Hardhat (31337), unchanged

How

getEnvConfigs() is the single source the whole dapp derives its chain list
from, so the filter is applied once at envConfigsFilteredByEnv in
src/lib/config.ts. That covers everything downstream:

• the network selector dropdown (NETWORK_SELECTOR_CHAINS)
• the "Connect to …" tooltip in the wallet status
• envChainIds → isSupportedChain() in lib/constants/chains.ts
• GQL_ENV_CHAINS for the subgraph queries
• getConfigsByChainId() / useSelectChain / useSyncChainQuery

Chain ids are hardcoded in the map (as the existing defaultChainIdPerEnv map
already does) to avoid a circular import with lib/constants/chains, which
reads envChainIds from lib/config.

The selector sorts by getChainPriority, so the resulting order is Ethereum
then Base on production, Sepolia then Base Sepolia on testing/staging.

Defaults are unaffected: the dapp still starts on Base / Base Sepolia.

Checks

• npx tsc --noEmit — clean
• eslint + prettier --check on the changed file — clean
• unit tests — 44 passed, 3 suites
• verified the filtered output per environment against the SDK configs:

  local       all: 31337                               => local-31337-0
  testing     all: 84532,11155111,80002,11155420,421614 => testing-84532-0, testing-11155111-0
  staging     all: 84532,11155111,80002,11155420,421614 => staging-84532-0, staging-11155111-0
  production  all: 8453,1,137,10,42161                  => production-8453-0, production-1-0
  

Note

Lens is Polygon-only (availableOnNetwork: [80001, 137]), so dropping Polygon
means the Lens integration is no longer reachable from the dapp. Flagging it in
case that is not intended.

🤖 Generated with Claude Code

[Copilot]

🟡 Changes recommended

An invalid (but truthy) REACT_APP_ENV_NAME value can cause a runtime crash at import time due to supportedChainIds being undefined and .includes(...) being called on it.

Get a fresh assessment by requesting another Copilot review.

Pull request overview

This PR restricts the dapp’s network selector (and all downstream chain-derived behavior) to only Ethereum/Base and their testnets by filtering the SDK-provided environment configs in a single place (envConfigsFilteredByEnv).

Changes:

• Added an environment-scoped allowlist of supported chain IDs and filtered getEnvConfigs(envName) accordingly.
• Improved the “no protocol config available” error to include the filtered chain IDs.
• Clarified the default-chain comment to reflect that the default is explicitly pinned rather than relying on config ordering.

File summaries

File	Description
src/lib/config.ts	Adds per-environment supported chain allowlist and filters env configs to restrict selectable/usable networks.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 1
• Review effort level: Lite

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