[AI] Add model card dialog to AI preferences

[andriiryzhkov]

Summary

• Adds a model card (transparency/provenance info) dialog accessible from the AI preferences tab
• Each model row has a clickable ℹ icon that opens the card
• Card fields are read on demand from config.json on disk – no memory overhead in the registry
• Fields: scope, author, source, paper, license, training data, data license, notes
• URLs (source, paper) rendered as clickable links
• Missing fields display en dash (–)
• Hand cursor + tooltip on the ℹ icon for discoverability

config.json schema

Card fields live under a nested model_card object:

{
    "id": "denoise-nind",
    "name": "denoise nind",
    ...
    "model_card": {
        "long_description": "Image denoiser trained on...",
        "scope": "single-image luminance denoising",
        "author": "Benoit Brummer (Catholic University of Louvain)",
        "source": "https://github.com/trougnouf/nind-denoise",
        "paper": "https://arxiv.org/abs/1906.00270",
        "license": "GPL-3.0",
        "training_data": "NIND dataset",
        "training_data_license": "CC BY 4.0 / CC0 (per-image, Wikimedia Commons)",
        "notes": "trained on publicly available academic data"
    }
}

Architecture

• ai_models.c/h: new dt_ai_model_card_t struct + dt_ai_models_get_card() / dt_ai_model_card_free() – reads config.json, returns owned strings
• preferences_ai.c: ℹ column, click handler, tooltip/cursor, dialog rendering – no JSON parsing in the GUI layer

Screenshot

Prerequisite

Model configs need model_card data: darktable-org/darktable-ai#17

Motivation

Addresses community request for AI model transparency: https://discuss.pixls.us/t/feature-request-navigating-the-ai-controversies/57052

[TurboGit]

For some reason the column with the i icon was hidden by default:

So not very discoverable. Also the i should certainly be centered on the column.

Also, for me it was a good time to check to new models being available but I still don't see the "update available" string on the UI.

[andriiryzhkov]

So not very discoverable. Also the i should certainly be centered on the column.

Oh, never seen scroll in the models table. Maybe we can move the info column. Just before the model name?

Also, for me it was a good time to check to new models being available but I still don't see the "update available" string on the UI.

Models versions did not change yet.

[TurboGit]

Oh, never seen scroll in the models table. Maybe we can move the info column. Just before the model name?

Would be a better place for the info column anyway. Not sure if this would fix the issue though.

[andriiryzhkov]

@TurboGit : I improved layout of models table. It is cleaner and always visible now. Model description is in the details now, no need to keep it in table.

[TurboGit]

@andriiryzhkov : This needs conflicts resolution. TIA.

[andriiryzhkov]

@TurboGit : Resolved

[TurboGit]

Thanks!