fix(connectors): throw on empty or whitespace WalletConnect projectId

[Zelys-DFKH]

Closes #5030

The WalletConnect connector accepted an empty string or whitespace-only projectId without complaint. When that happened, the QR modal never appeared and connections failed silently. No error, no log, nothing. This comes up when VITE_WC_PROJECT_ID (or the React/Next equivalent) is missing, or when a .env file has a trailing newline that corrupts the value.

The fix trims and checks projectId at connector creation and throws a BaseError immediately if it's falsy. Fail at config time, not at user-click time.

Changes

• packages/connectors/src/walletConnect.ts — validate projectId at the top of walletConnect(), before any lazy provider initialization runs
• packages/connectors/src/walletConnect.test.ts — two tests covering empty string and whitespace-only

[changeset-bot]

🦋 Changeset detected

Latest commit: 9855118

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 4 packages

Name	Type
@wagmi/connectors	Patch
wagmi	Patch
@wagmi/solid	Patch
@wagmi/vue	Patch

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[tmm]

Thanks for the PR! Better if this is handled at the WalletConnect SDK-level

[Zelys-DFKH]

Thanks for the feedback. Understood. This belongs at the SDK level. Closing in favor of that approach.

[Zelys-DFKH]

Following your feedback, I've submitted the projectId validation fix upstream to WalletConnect/walletconnect-monorepo#7216 as you suggested. This ensures the fix benefits all SDKs that depend on EthereumProvider, not just wagmi.