Better developing experience for Desktop rendering

Title

Improve Organization of Desktop Icons & Workspace Sidebars by Module Context

Is your feature request related to a problem? Please describe.

Currently, all desktop icons and workspace sidebars are stored in the same directories within a custom app. In non-developer mode, these items are not organized or sorted in a meaningful way, making them difficult to manage.

This limitation becomes especially problematic when working with larger custom apps or partial configurations.

Related issue: https://github.com/frappe/frappe/issues/38182#issue-4119421260

Describe the solution you'd like

Desktop icons, workspace sidebars, and similar configurations should be organized based on module context:

• In developer_mode:

  • Items should be grouped and stored under their respective modules.

• In non-developer mode:

  • Items should be grouped under a virtual module structure to maintain logical organization.

This would:

• Improve discoverability of configurations
• Simplify navigation and maintenance
• Make it easier to extract and move only relevant customizations into custom apps
• Enhance reproducibility of selective configurations

Describe alternati