CORE-329 feat: add Save 3D (Advanced) node family

[jtydhr88]

Add Save3DAdvanced, SaveGaussianSplat, and SavePointCloud as the save-side counterparts to the advanced preview nodes (Preview 3D (Advanced), Preview Splat, Preview Point Cloud).

Each mirrors its preview node's input/output shape and display name, and saves the File3D to the output directory under filename_prefix (preserving the original format), then emits PreviewUI3DAdvanced for the viewport.

FE change - Comfy-Org/ComfyUI_frontend#13330

Screenshot
Save 3D (Advanced)

Save Splat

[coderabbitai]

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📝 Walkthrough

Walkthrough

This change adds advanced 3D save support in comfy_extras/nodes_save_3d.py. It adds shared helpers for saving Types.File3D outputs and building a preview node response with camera and model metadata. It also introduces Save3DAdvanced, SaveGaussianSplat, and SavePointCloud, and registers them in the 3D save extension.

🚥 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 clearly summarizes the main change: adding a new Save 3D advanced node family.
Description check	✅ Passed	The description matches the changes by describing the new save-side 3D nodes and their preview counterparts.
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.

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@comfy_extras/nodes_save_3d.py`:
- Around line 409-420: The 3D save path helper is not forwarding the node’s
actual dimensions, so `%width%` and `%height%` in filename_prefix resolve to 0.
Update `_save_file3d_to_output` and its caller from `execute_save_3d_advanced`
to pass the real width/height values into `folder_paths.get_save_image_path`,
matching the pattern used by other Save* nodes so templated filenames use the
node inputs instead of defaults.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 50e5270 and eea3502.

📒 Files selected for processing (1)

• comfy_extras/nodes_save_3d.py