Render static 3D preview images using F3D

[Floppy]

HUGE feature, this one. We can use https://f3d.app to render preview images server-side:

Screen.Recording.2026-02-04.at.15.26.51.mov

Code works now, but we need to get F3D into the Docker container before it can be released.

Resolves #1706

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.11% (target: -1.00%)	✅ 47.37%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (6f85c10)	6088	5147	84.54%
Head commit (36972df)	6104 (+16)	5154 (+7)	84.44% (-0.11%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#5438)	19	9	47.37%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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