frontend: SelectionBreadcrumbs: Add Storybook stories

[vividwhisp]

Summary

This PR adds Storybook stories for the SelectionBreadcrumbs component to improve visual documentation and snapshot test coverage.

Related Issue

Fixes #6467

Changes

• Added frontend/src/components/resourceMap/SelectionBreadcrumbs.stories.tsx with 4 stories:
  • RootSelected — breadcrumbs showing just "Home"
  • DirectChild — breadcrumbs showing "Home > Workloads"
  • DeepNested — breadcrumbs showing "Home > default > nginx-pod" with subtitles
  • WithKubeObject — breadcrumbs rendering a KubeIcon (Pod) + subtitle + label

Steps to Test

1. Run npm run frontend:test to verify snapshot tests pass
2. Run npm run frontend:storybook and navigate to ResourceMap/SelectionBreadcrumbs
3. Verify all 4 stories render correctly

Notes for the Reviewer

• The component is purely props-driven — no MSW handlers or store setup needed
• All 4 stories have full storyshots enabled (no play functions)

[kubernetes-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: vividwhisp
Once this PR has been reviewed and has the lgtm label, please assign joaquimrocha for approval. For more information see the Code Review Process.

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[vividwhisp]

@illume @sniok @skoeva review request

[Copilot]

Pull request overview

Adds Storybook coverage for SelectionBreadcrumbs in the Resource Map area of the frontend, improving visual documentation and ensuring the Storybook snapshot suite covers key breadcrumb states.

Changes:

• Added SelectionBreadcrumbs Storybook stories covering root, shallow, deep, and kubeObject/icon variants.
• Added new storyshot snapshot baselines for each story variant.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
frontend/src/components/resourceMap/SelectionBreadcrumbs.stories.tsx	Adds Storybook stories + test decorator context for SelectionBreadcrumbs.
frontend/src/components/resourceMap/snapshots/SelectionBreadcrumbs.RootSelected.stories.storyshot	New snapshot baseline for the root-only breadcrumb state.
frontend/src/components/resourceMap/snapshots/SelectionBreadcrumbs.DirectChild.stories.storyshot	New snapshot baseline for a 1-level breadcrumb state.
frontend/src/components/resourceMap/snapshots/SelectionBreadcrumbs.DeepNested.stories.storyshot	New snapshot baseline for a deep breadcrumb path with subtitles.
frontend/src/components/resourceMap/snapshots/SelectionBreadcrumbs.WithKubeObject.stories.storyshot	New snapshot baseline for kubeObject rendering (icon + kind subtitle + name).

[vividwhisp]

i resolved the comments
@illume