[Partner Nodes] fix Quiver nodes

[bigcat88]

Fixes the Image URL must return an image content type error

API Node PR Checklist

Scope

• Is API Node Change

Pricing & Billing

• Need pricing update
• No pricing update

If Need pricing update:

• Metronome rate cards updated
• Auto‑billing tests updated and passing

QA

• QA done
• QA not required

Comms

• Informed Kosinkadink

[coderabbitai]

📝 Walkthrough

Walkthrough

This PR adds explicit MIME type specification to image uploads in the Quiver node implementations. The upload_image_to_comfyapi function is called twice: once per reference image in QuiverTextToSVGNode.execute (line 146) and once for the input image in QuiverImageToSVGNode.execute (line 255). Both calls now include mime_type="image/png" to declare the image format during upload. No changes to request composition, API endpoints, response handling, or SVG output construction.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title references fixing Quiver nodes, which directly matches the changeset that updates Quiver image uploads with explicit mime_type parameters.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The pull request description clearly addresses a specific error ('Image URL must return an image content type') and relates to the changeset which adds mime_type specifications to Quiver node image uploads.

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