fix: KEEP-291 config panel retains previous node's field inputs

[suisuss]

Summary

• Adds key={selectedNode.id} on the per-node config wrapper in components/workflow/node-config-panel.tsx so the subtree fully unmounts and remounts when a different node is selected.
• Root cause: React preserved leaf-component state across prop changes (e.g. AbiFunctionArgsField.localArgValues, FieldGroup.isExpanded) because the components stayed at the same tree position. Result was old node's field inputs persisting after clicking a new node.
• This replaces the per-field workaround pattern (the existing category resync effect in action-config.tsx) with a structural fix that holds for any future field component that uses local state.

Test plan

• Open a workflow with two or more configured action nodes
• Click node A, confirm its field inputs render
• Click node B, confirm its field inputs replace A's (no stale values)
• Repeat with trigger + action pair
• Repeat with two nodes calling the same ABI function name (e.g. both transfer) - the arg values in AbiFunctionArgsField should reflect the newly-selected node
• Verify expand/collapse state of FieldGroup doesn't leak across nodes
• Spot-check that editing a field on one node still updates correctly (no regression in the within-node edit path)

[github-actions]

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Environment Details:

• URL: https://app-pr-904.keeperhub.com
• Namespace: pr-904
• Cluster: techops-staging
• Image Tag: 3191e33
• Commit: 3191e33f72b572c18fa585c8b603809f1411b79b

Components:

• Keeperhub Application
• PostgreSQL Database (isolated instance)
• LocalStack (SQS emulation)
• Redis (isolated instance)
• Schedule Dispatcher (staging image)
• Block Dispatcher (staging image)
• Event Tracker (staging image)

The environment will be automatically cleaned up when this PR is closed or merged.

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• Namespace: pr-904
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• PostgreSQL Database (including data)
• LocalStack, Redis
• All associated secrets and configs

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