Add attach-based node debugger workflow that mirrors kubectl debug node

[dorser]

Summary

This PR implements #4167. This work aligns node debugger workflow with kubectl debug node. It provisions a busybox debugger container, attaches without running shell commands, and gracefully terminates the session on close (This also fixes the behavior when the window closes abruptly).

Related Issue

Implements #4167

Changes

• Updated frontend/src/components/node/NodeShellAction.tsx to rename the entry point to “Debug Node” and use a debugger icon.
• Updated frontend/src/helpers/clusterSettings.ts to default the node debugger image to busybox and run it in the default namespace.
• Reworked frontend/src/components/node/NodeShellTerminal.tsx so the generated pod mirrors kubectl debug node (host mounts, tolerations, stdin/tty flags, attach URL) and so the session is cleaned up by sending exit on close/beforeunload/unmount.

Steps to Test

1. Build and run Headlamp
2. Navigate to any Linux node and click the “Debug Node” action.
3. Verify that a node-debugger-* pod appears in the configured namespace, that the terminal attaches without launching a new shell command, and that closing the dialog/tab finishes the pod after an exit is sent.

[joaquimrocha]

@skoeva , can you test this PR?

[Copilot]

Pull Request Overview

This PR refactors the node debugging feature to align with kubectl debug node behavior. It transitions from a privileged shell-based approach using alpine to an attach-based debugger workflow using busybox, changes the default namespace from kube-system to default, and implements graceful session cleanup.

Key changes:

• Replaces exec-based shell launching with attach-based debugging workflow
• Changes default image from alpine to busybox and default namespace from kube-system to default
• Implements exit command-based cleanup instead of explicit pod deletion
• Updates UI labels from "Node Shell" to "Debug Node"

Reviewed Changes

Copilot reviewed 29 out of 29 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
frontend/src/components/node/NodeShellTerminal.tsx	Core workflow refactoring: pod spec now mirrors kubectl debug node with host mounts, tolerations, stdin/tty flags, and attach URL; adds exit-based cleanup handlers
frontend/src/components/node/NodeShellAction.tsx	Updates UI label to "Debug Node" and changes icon to mdi:bug
frontend/src/helpers/clusterSettings.ts	Changes default image to busybox:latest and default namespace to 'default'
frontend/src/components/App/Settings/NodeShellSettings.tsx	Updates settings UI to reflect new namespace default
frontend/src/i18n/locales/*/glossary.json	Updates translations for "Node Shell" → "Debug Node" and error messages
frontend/src/i18n/locales/*/translation.json	Updates namespace default description across all locales
frontend/src/components/App/Settings/snapshots/NodeShellSettings.Default.stories.storyshot	Updates snapshot to reflect new defaults

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[joaquimrocha]

@farodin91 , do you have any comments? I thought of asking you since you have contributed the node-shell changes.

[joaquimrocha]

I have read more about the differences in debug vs the approach we had. I like how tit makes it closer to the kubectl debug.
I have also tested and it works fine. Thanks @dorser !

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dorser, joaquimrocha

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