Added the custom list widget

[alayham]

Category: Feature

Overview
Added a new widget to display custom schema-compliant JSON in lists. The schema is included in the documentation, along with an example.
The JSON input for this list includes a date, and the widget can be configured to highlight list items that are newer than a certain number of days in the past.
The list format is very similar to other list widgets like the Proxmox widget and the public holidays widget.

Why
Widgets are rendered on every page load. It is more efficient to cache the widget data when the widget does not require real time updates on every page load, and this can be done using a script, a cron job, or a data pipeline.

Screenshot

Testing
The above screenshot was generated from the following configuration

      - type: custom-list
        options:
          url: /json-data/github-releases.json
          title: 'Github Releases'
          daysForNew: 5

The input json is:

[
    {
        "link": {
            "text": "jellyfin/jellyfin",
            "url": "https://github.com/jellyfin/jellyfin/releases/tag/v10.10.7",
            "title": ""
        },
        "value": {
            "text": "v10.10.7",
            "title": "2025-04-05"
        },
        "date": "2025-04-05T19:14:59Z"
    },
    {
        "link": {
            "text": "jellyfin/jellyfin-web",
            "url": "https://github.com/jellyfin/jellyfin-web/releases/tag/v10.10.7",
            "title": ""
        },
        "value": {
            "text": "v10.10.7",
            "title": "2025-04-05"
        },
        "date": "2025-04-05T19:15:00Z"
    },
    {
        "link": {
            "text": "lissy93/dashy",
            "url": "https://github.com/Lissy93/dashy/releases/tag/3.1.1",
            "title": ""
        },
        "value": {
            "text": "3.1.1",
            "title": "2024-05-30"
        },
        "date": "2024-05-30T17:20:53Z"
    },
    {
        "link": {
            "text": "VSCodium/vscodium",
            "url": "https://github.com/VSCodium/vscodium/releases/tag/1.102.14746",
            "title": ""
        },
        "value": {
            "text": "1.102.14746",
            "title": "2025-07-16"
        },
        "date": "2025-07-16T18:27:49Z"
    }
]

To test the widget, put this json data in a file inside the user-data directory, and point the widget to it.

Code Quality Checklist

• All changes are backwards compatible
• All lint checks and tests are passing
• There are no (new) build warnings or errors
• (If a new config option is added) Attribute is outlined in the schema and documented
• (If a new dependency is added) Package is essential, and has been checked out for security or performance
• (If significant change) Bumps version in package.json

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[Lissy93]

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