[Partner Nodes] feat(Grok): add 1080p resolution to Grok Image node

[bigcat88]

Also we will switch from grok-imagine-video-1.5-preview to the grok-imagine-video-1.5 model ID.

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

The PR updates comfy_api_nodes/nodes_grok.py to add 1080p resolution support to GrokVideoNode. The internal API model mapping for "grok-imagine-video-1.5" is changed from the -preview identifier to the stable one. The resolution schema input gains a 1080p option with an updated tooltip. The price_badge USD calculation is reworked with new per-resolution rates, a revised image-connected cost add-on, and a * 1.43 multiplier applied to the final total. A runtime ValueError is added in execute to reject resolution == "1080p" when the selected model is not grok-imagine-video-1.5.

🚥 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 mentions adding 1080p resolution to the Grok Image node, which aligns with the main change of exposing 1080p resolution support and updating model identifiers.
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 directly addresses the changeset by mentioning the model ID switch and includes a completed API Node PR Checklist relevant to the changes.

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