fix(router): suppress abort errors in single fetch

[yoni-noma]

Description

Fixes a navigation crash caused by aborted single-fetch data requests (fetchers and navigations). Some browsers throw a TypeError before the abort signal is marked, so we normalize aborts and only use a TypeError-message fallback for that race.

Changes

• Normalize fetch aborts in fetchAndDecodeViaTurboStream and treat abort results as empty data
• Add integration coverage for navigation during active fetcher polling
• TypeError-only fallback for the abort race (signal/AbortError checks preferred)

Impact

Prevents abort-related errors (TypeError: Failed to Fetch, Load Failed, etc.) from reaching the error boundary during navigation while keeping non-abort failures intact.

Related: #14203

Test plan

• not run (tests can be long; run in CI/local as needed)

[changeset-bot]

🦋 Changeset detected

Latest commit: 0fc8dba

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

This PR includes changesets to release 11 packages

Name	Type
react-router	Patch
@react-router/architect	Patch
@react-router/cloudflare	Patch
@react-router/dev	Patch
react-router-dom	Patch
@react-router/express	Patch
@react-router/node	Patch
@react-router/serve	Patch
@react-router/fs-routes	Patch
@react-router/remix-routes-option-adapter	Patch
create-react-router	Patch

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[remix-cla-bot]

Thank you for signing the Contributor License Agreement. Let's get this merged! 🥳

[yoni-noma]

Added a short note in code: we prefer abort signal/AbortError checks and only fall back to TypeError message matching to handle browser abort race cases. The fallback is intentionally narrow (TypeError-only) to minimize false positives. Should improve behavior for Chrome/Safari/Firefox where aborted fetches sometimes surface as TypeError.