upstreamable: resourceMap: group unscheduled pods in node view

[gambtho]

Summary

Pods without a spec.nodeName (e.g. pending due to quota or scheduling failures) were silently ungrouped in the Map tab's "Group by Node" view. This made it impossible to see or troubleshoot unscheduled pods from the Map.

• Return an "Unscheduled" sentinel instead of undefined for pods without nodeName, so they appear in a visible group
• Skip K8s Node object linking for the Unscheduled group (no real node to link)
• Updated existing test + added new test for the Unscheduled group

Type of Change

• Bug fix (non-breaking change which fixes an issue)

Related Issues

Fixes #492 (partially — Map tab fix only; quota warning is in #494)

Changes Made

File	Change
graphGrouping.tsx	Node grouping accessor returns 'Unscheduled' for pods without nodeName; guard added to skip Node object linking for the Unscheduled group
graphGrouping.test.ts	Updated "groups nodes by node" expectations; added test verifying Unscheduled group has no linked kubeObject

Testing

• Unit tests pass (npx vitest run graphGrouping)
• 10/10 grouping tests pass including 2 updated/new tests

Test Cases

1. Pods without nodeName are grouped into Node-Unscheduled (updated existing test)
2. Unscheduled group has label 'Unscheduled', no linked kubeObject, and correct member count (new test)
3. Pods with nodeName continue to group correctly under their node (existing, unchanged)

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my own code
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[Copilot]

Pull request overview

Fixes Map tab “Group by Node” view so Pods without spec.nodeName appear as a visible “Unscheduled” group, and avoids linking that group to a nonexistent K8s Node object.

Changes:

• Node grouping accessor returns an "Unscheduled" sentinel for Pods missing spec.nodeName
• Prevents K8s Node object linking for the Unscheduled group
• Updates/extends unit tests to cover the Unscheduled grouping behavior

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
frontend/src/components/resourceMap/graph/graphGrouping.tsx	Adds “Unscheduled” sentinel grouping and guards K8s Node linking for it
frontend/src/components/resourceMap/graph/graphGrouping.test.ts	Updates expectations for node grouping and adds a test for Unscheduled group behavior

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.