fix(ui): prevent replace failed node without selecting a node

[Copilot]

The Nodes Manager dialog allowed users to proceed with the "replace failed node" workflow without actually selecting a node to replace. This resulted in users being able to click through all the steps (Action → Node Id → Inclusion Mode) without any validation, but no actual replacement would occur in the backend since no node ID was provided.

Problem

In the DialogNodesManager.vue component, the nextStep() function processed the 'replaceFailed' step without validating whether a node had been selected (replaceId value). This allowed the workflow to proceed to the inclusion mode step even when replaceId was null or undefined.

Solution

Added proper validation to prevent progression without node selection:

1. Created submitReplaceFailed() validation function that:

   • Validates that a node has been selected before proceeding
   • Shows user-friendly error messages via snackbar notifications
   • Validates numeric node IDs when manually entered
   • Only calls nextStep() after successful validation

2. Updated the Next button in the replaceFailed step to use submitReplaceFailed() instead of directly calling nextStep()

3. Added informative error messages:

   • "Please select a node to replace" when no node is selected
   • "Please enter a valid node ID" for invalid numeric input

Before/After

Before: Users could click "NEXT" without selecting a node and proceed through all steps, but nothing would happen in the backend.

After: Users must select a valid node before they can proceed, with clear error messages guiding them when validation fails.

The fix maintains full backward compatibility while ensuring the replace failed node workflow requires proper node selection.

Fixes #4379.

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[coveralls]

Pull Request Test Coverage Report for Build 18283848149

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Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 20.321%

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Totals
Change from base Build 18283781436:	0.0%
Covered Lines:	3959
Relevant Lines:	20731

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💛 - Coveralls