fix(links): let CivitAI and HuggingFace links coexist (#1094)

A model could have CivitAI metadata and a HuggingFace link at the same time,
but only one of the two "View on ..." entries ever rendered, because both the
model modal and the card globe asked the `from_civitai` provenance flag which
source to show. `set_hf_url` wrote `false` and a CivitAI refresh wrote `true`,
so whichever ran last erased the other: linking HF hid "View on CivitAI" even
though the civitai payload was still in the sidecar, and (on the card) a later
refresh pointed the single globe icon back at CivitAI, hiding the HF entry.

Decide the links from the data itself instead:

- `set_hf_url` no longer touches `from_civitai`; it records where the metadata
  came from, and HF provenance is already tracked by `hf_url`.
- Add `hasCivitaiSource(civitai)` in the shared card/modal utils and gate the
  modal's CivitAI link, the card globe (title, enabled state, click target,
  new `data-has_civitai`) and the context-menu `civitai` action on actual
  CivitAI data (`modelId` / `model_id` / `id`). A dual-source model now shows
  both links, and a CivitAI-only model with no `hf_url` stays as before.
- Agent HF enrichment (`PostProcessor.is_hf_model`) keyed off
  `not from_civitai`, which stopped being a synonym for "has an HF source" once
  both sources can coexist (and already broke after a CivitAI refresh flipped
  the flag back to true). Key it off `hf_url` directly; the post-processor
  tests move to that discriminator and gain a dual-source case.

Regression tests: the set-hf-url handler preserves civitai + `from_civitai`
and no longer forces the flag false, the modal renders both links (including
with `from_civitai: false`), and the card globe targets/opens the right source
and is disabled when neither is available.

Backend: 2749 passed. Frontend: 1098 JS + 91 Vue tests passed.

static/js/components/shared/ModelModal.js

@@ -14,7 +14,7 @@ import {
 } from './ModelMetadata.js';
 import { setupTagEditMode } from './ModelTags.js';
 import { getModelApiClient } from '../../api/modelApiFactory.js';
-import { renderCompactTags, setupTagTooltip, formatFileSize, escapeAttribute, escapeHtml } from './utils.js';
+import { renderCompactTags, setupTagTooltip, formatFileSize, escapeAttribute, escapeHtml, hasCivitaiSource } from './utils.js';
 import { renderTriggerWords, setupTriggerWordsEditMode } from './TriggerWords.js';
 import { parsePresets, renderPresetTags } from './PresetTags.js';
 import { initVersionsTab } from './ModelVersionsTab.js';
@@ -389,7 +389,11 @@ export async function showModelModal(model, modelType) {
     const licenseIcons = useNewIcons
         ? renderNewLicenseIcons(modelWithFullData)
         : renderLicenseIcons(modelWithFullData);
-    const viewOnCivitaiAction = modelWithFullData.from_civitai ? `
+    // Gate the CivitAI link on actual CivitAI data, not the `from_civitai`
+    // provenance flag: a model can be linked to HuggingFace and to CivitAI at
+    // the same time, and both links must coexist (#1094).
+    const hasCivitai = hasCivitaiSource(modelWithFullData.civitai);
+    const viewOnCivitaiAction = hasCivitai ? `
 <div class="civitai-view" title="${translate('modals.model.actions.viewOnCivitai', {}, 'View on Civitai')}" data-action="view-civitai" data-filepath="${escapedFilePathAttr}">
     <i class="fas fa-globe"></i> ${translate('modals.model.actions.viewOnCivitaiText', {}, 'View on Civitai')}
 </div>`.trim() : '';