[TASK] Secrets attachment modal

[thaorell]

Certification

• I certify I am an Epic Owner for Kubeflow Notebooks 2.0 and expected to create planning-related issues.

Description

As a Workspace user, Bella needs a simple way to attach sensitive information (like API keys, database passwords, or service account files) to her Workspace k8s pods. Bella should be able to either select from a list of existing secrets without needing to understand underlying Kubernetes concepts.

This task involves creating a single, comprehensive modal that serves as the primary UI for managing and attaching all secrets related to a Workspace. This modal will be triggered by an "Attach Secrets" button in the Workspace configuration page.

Acceptance Criteria

• The modal displays a searchable, filterable list of all available secrets (i.e. from GET /api/v1/secrets/{namespace}).
• A primary "Attach" button is shown.
• Note: Clicking this button does not call the secrets API. It only updates the local Workspace configuration.
• The modal closes, and the "Current Attachments" list is updated.

[thaorell]

/area frontend
/area v2

[thaorell]

/assign