frontend: pod: Add target container support to debug containers

[yush-1018]

Summary

This PR adds target container support to Headlamp's ephemeral debug containers.

When debugging a pod:

• Single-container pods: The debug shell automatically targets the container.
• Multi-container pods: Users get a dialog to select which container to target (or choose "None").

Targeting shares the process namespace and filesystem (via /proc/<pid>/root) of the application container, making debugging much more useful.

Key Changes

• Added a container selector dialog for multi-container pods.
• Added targetContainerName to KubeContainer types and removed any from findRunningDebugContainer.
• Added new Storybook stories and updated English/Hindi localization keys.

Related Issues

Fixes #4914
Supersedes #5461

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: yush-1018
Once this PR has been reviewed and has the lgtm label, please assign joaquimrocha for approval. For more information see the Code Review Process.

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[Copilot]

Pull request overview

This PR implements Kubernetes ephemeral debug container targeting for pods, enabling the debug container to share namespaces (PID/IPC/etc.) with a chosen application container. This improves the usefulness of Headlamp’s “Debug Pod” flow by aligning it with the targetContainerName capability in the K8s ephemeral container API.

Changes:

• Extended Pod.addEphemeralContainer to optionally set targetContainerName on the ephemeral container spec, and added a unit test to validate the PATCH body behavior.
• Updated the pod debug terminal flow to (a) select/attach to an existing running debug container that matches the requested target and (b) create a targeted debug container when needed.
• Added a UI container-target picker for multi-container pods, plus Storybook stories/snapshots and new i18n keys across locales.

Reviewed changes

Copilot reviewed 25 out of 25 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
frontend/src/lib/k8s/pod.ts	Adds optional targetContainerName support when creating ephemeral containers.
frontend/src/lib/k8s/pod.test.ts	Adds tests asserting targetContainerName is included/omitted in the PATCH body.
frontend/src/lib/k8s/cluster.ts	Extends KubeContainer type to include optional targetContainerName.
frontend/src/components/pod/PodDebugTerminal.tsx	Threads target selection through debug creation/attachment and removes any from findRunningDebugContainer.
frontend/src/components/pod/PodDebugAction.tsx	Adds multi-container target selection dialog; single-container pods auto-target their only container.
frontend/src/components/pod/PodDebugTerminal.stories.tsx	Adds stories for targeted debugging and a multi-container pod mock; updates MSW handlers.
frontend/src/components/pod/snapshots/PodDebugTerminal.Default.stories.storyshot	Updates snapshots to reflect new terminal wrapper/layout and output.
frontend/src/components/pod/snapshots/PodDebugTerminal.WithTargetContainer.stories.storyshot	New snapshot for targeted debug terminal story.
frontend/src/components/pod/snapshots/PodDebugTerminal.MultiContainerWithTarget.stories.storyshot	New snapshot for multi-container targeted debug terminal story.
frontend/src/i18n/locales/en/translation.json	Adds new debug-targeting UI strings in English.
frontend/src/i18n/locales/hi/translation.json	Adds Hindi translations for the new debug-targeting UI strings.
frontend/src/i18n/locales/ar/translation.json	Adds new keys (empty values fall back to English).
frontend/src/i18n/locales/de/translation.json	Adds new keys (empty values fall back to English).
frontend/src/i18n/locales/es/translation.json	Adds new keys (empty values fall back to English).
frontend/src/i18n/locales/fr/translation.json	Adds new keys (empty values fall back to English).
frontend/src/i18n/locales/he/translation.json	Adds new keys (empty values fall back to English).
frontend/src/i18n/locales/it/translation.json	Adds new keys (empty values fall back to English).
frontend/src/i18n/locales/ja/translation.json	Adds new keys (empty values fall back to English).
frontend/src/i18n/locales/ko/translation.json	Adds new keys (empty values fall back to English).
frontend/src/i18n/locales/pt/translation.json	Adds new keys (empty values fall back to English).
frontend/src/i18n/locales/ru/translation.json	Adds new keys (empty values fall back to English).
frontend/src/i18n/locales/ta/translation.json	Adds new keys (empty values fall back to English).
frontend/src/i18n/locales/ur/translation.json	Adds new keys (empty values fall back to English).
frontend/src/i18n/locales/zh/translation.json	Adds new keys (empty values fall back to English).
frontend/src/i18n/locales/zh-tw/translation.json	Adds new keys (empty values fall back to English).

[illume]

Thanks for the contribution.

The GitHub CI test job has snapshot failures. Run cd frontend && npm run test -- -u to regenerate the snapshots.

How to update snapshots

Run cd frontend && npm run test -- -u to regenerate all snapshots. Review the diff to make sure the visual changes are intentional, then commit the updated snapshot files.

[illume]

Thanks for these changes.

can you please rebase against main to remove the merge main commit?

Why this matters

Merge commits from main make the PR history harder to review. Please rebase your branch on top of the latest main instead, then update the PR with the rebased commits.

I noticed the GitHub CI frontend lint job is failing. Can you please fix the lint errors? You can run cd frontend && npm run lint locally to see the errors.

How to fix lint errors

Run cd frontend && npm run lint to see all ESLint errors. Many can be fixed automatically with cd frontend && npm run lint -- --fix. Remaining errors need manual attention.

[Copilot]

Pull request overview

Copilot reviewed 25 out of 25 changed files in this pull request and generated no new comments.

[kubernetes-prow]

PR needs rebase.

Details

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[illume]

Thanks for these changes.

It looks like this PR has git conflicts. Can you please fix them?

How to resolve conflicts

Rebase or merge the latest main into your branch, resolve the conflicts, and push the updated branch.

[kubernetes-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: yush-1018
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

[Suyog241005]

Hi @illume @yush-1018!
I noticed this PR is in the active v0.45.0 milestone but has open conflicts and failing CI checks.
I'd be happy to take this over for the milestone. I can rebase it cleanly onto latest main, fix the lint errors and fix the CI build failures.