fix(core): clean up injected switchChain listener on failure

[yuyua9]

Summary

• remove the injected connector change listener when switchChain fails before the chain-change confirmation arrives
• keep the listener active for the 4902 wallet_addEthereumChain retry flow, and clean it up if that retry fails
• add a regression test plus a patch changeset for @wagmi/core

This mirrors the leak pattern fixed for WalletConnect in #5033 and the behavior reported in #5032, but applies it to the injected connector path that still had the same failure cleanup gap.

Tests

• pnpm dlx @biomejs/biome@2.2.4 check packages/core/src/connectors/injected.ts packages/core/src/connectors/injected.test.ts .changeset/injected-switchchain-listener-leak.md
• git diff --check HEAD~1..HEAD

Not run successfully:

• pnpm exec vitest packages/core/src/connectors/injected.test.ts --run (blocked because vitest was unavailable; pnpm install --frozen-lockfile --ignore-scripts repeatedly failed with registry ECONNRESET before dependencies were fully installed)

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[changeset-bot]

🦋 Changeset detected

Latest commit: 1a5aa86

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

This PR includes changesets to release 5 packages

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

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