fix(editor): Improve chat error handling (no-changelog)

[autologie]

Summary

Tested sending many attachment files. Server responded with status 413, which is expected, but the chat UI wasn't able to present any feedback because streamRequest function didn't call onError callback function. Also adding more user-friendly messages.

Related Linear tickets, Github issues, and Community forum posts

Review / Merge checklist

• PR title and summary are descriptive. (conventions)
• Docs updated or follow-up ticket created.
• Tests included.
• PR Labeled with release/backport (if the PR is an urgent fix that needs to be backported)

[cubic-dev-ai]

No issues found across 5 files

[bundlemon]

BundleMon

Unchanged files (2)

Status	Path	Size	Limits
✅	WASM Dependencies tree-sitter-bash.wasm	181.26KB	-
✅	WASM Dependencies tree-sitter.wasm	74.47KB	-

No change in files bundle size

Groups updated (2)

Status	Path	Size	Limits
✅	**/*.js	11.43MB (+146.82KB +1.27%)	-
✅	**/*.css	233.4KB (+12.63KB +5.72%)	-

Final result: ✅

View report in BundleMon website ➡️

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Current branch size history | Target branch size history

[codecov]

Codecov Report

❌ Patch coverage is 37.50000% with 30 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...nd/editor-ui/src/features/ai/chatHub/chat.store.ts	14.81%	23 Missing ⚠️
...ackages/frontend/@n8n/rest-api-client/src/utils.ts	77.77%	4 Missing ⚠️
...end/editor-ui/src/features/ai/chatHub/ChatView.vue	0.00%	3 Missing ⚠️

📢 Thoughts on this report? Let us know!

[currents-bot]

✅

E2E Tests: n8n tests passed after 12m 0.5s

🟢 573 · 🔴 0 · ⚪️ 37 · 🟣 1

View Run Details

Run Details

• Project: n8n

• Groups: 2

• Framework: Playwright

• Run Status: Passed

• Commit: 0d65f4d

• Spec files: 122

• Overall tests: 610

• Duration: 12m 0.5s

• Parallelization: 9

Groups

GroupId	Results	Spec Files Progress
multi-main:ui:isolated	🟢 54 · 🔴 0 · ⚪️ 0	8 / 8
multi-main:ui	🟢 519 · 🔴 0 · ⚪️ 37 · 🟣 1	114 / 114

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