feat(editor): Separate node execution and validation error states

[Tuukkaa]

Summary

Separates node execution errors from validation errors in the canvas UI and removes redundant spinner from waiting state.

Changes:

• Split issues.items into separate issues.execution and issues.validation arrays
• Added new node-validation-error icon to design system
• Updated canvas components to display appropriate icons for each error type
• Removed extra spinner from node waiting state
• Enhanced canvas mapping logic to handle separate error states

Related Linear tickets, Github issues, and Community forum posts

https://linear.app/n8n/issue/DS-208/separate-state-for-node-execution-and-validation-errors

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)

[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	5.73MB (+367.77KB +6.69%)	-
✅	**/*.css	195.21KB (+3.96KB +2.07%)	-

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 75.86207% with 14 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...nodes/render-types/parts/CanvasNodeStatusIcons.vue	15.38%	11 Missing ⚠️
...tend/editor-ui/src/composables/useCanvasMapping.ts	90.32%	2 Missing and 1 partial ⚠️

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