Add preview for 3d models

[IshwaryaM1030]

Closes #64

[github-actions]

📝 Draft Changelog Entry

Changelog

3D model file previews are now available. Users can view 3D model files directly in the file preview interface without needing to download them separately.

This changelog entry was automatically generated by the Changelog Generator Action.

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
__init__.py	11	5	54%	13–14, 20–22
commands.py	35	35	0%	4–6, 9–11, 17–20, 23, 26–27, 49–51, 53–54, 56, 65, 68–72, 75–76, 85–87, 89–90, 92, 94, 97
customize.py	25	25	0%	4–5, 7, 10–12, 15–22, 27–35, 47–48
hooks.py	15	0	100%
install.py	36	36	0%	4–7, 10–11, 14–18, 21–27, 30–34, 36–39, 41–49
migration.py	196	115	41%	25, 46, 68–69, 88–89, 96, 115, 123–125, 158–159, 161–162, 166–168, 171–172, 187, 196–197, 199–203, 205–210, 212, 219–221, 223, 225–226, 228, 235–236, 238–242, 244–247, 249, 254–257, 259–268, 270–279, 281–282, 284–285, 287–288, 290–294, 298–301, 305, 307–308, 310, 312–314, 317–318, 320–321, 323–329, 331–332, 334, 336
cloud_storage
__init__.py	0	0	100%
cloud_storage/doctype
__init__.py	0	0	100%
cloud_storage/doctype/file_association
__init__.py	0	0	100%
file_association.py	3	0	100%
cloud_storage/doctype/file_version
__init__.py	0	0	100%
file_version.py	3	0	100%
cloud_storage/overrides
file.py	431	151	64%	66, 76, 96, 119, 121, 136, 138, 145–147, 155–156, 171, 176, 183, 198, 231, 241–250, 252–260, 271, 276–277, 285–287, 289, 294, 300, 302, 318, 322, 327, 335–336, 339, 342, 371, 416, 419, 458, 464, 470, 476, 482, 488, 498, 500–502, 506, 514–516, 518, 533, 536, 547–551, 557–558, 560, 583–587, 599–600, 649, 652–661, 668–669, 671–673, 676–677, 682–684, 686, 691–694, 699, 701, 713–714, 716, 721–725, 727, 738–744, 762, 764–765, 768–770, 772–774, 779–780, 786–787, 790–791, 801–804
config
__init__.py	0	0	100%
desktop.py	3	3	0%	4, 7–8
docs.py	6	6	0%	4, 6–8, 12–13
tests
conftest.py	43	1	97%	54
test_file.py	173	6	96%	89, 174, 208–210, 223
test_file_preview.py	63	0	100%
test_local_storage.py	61	0	100%
TOTAL	1104	383	65%

[IshwaryaM1030]

@agritheory For your reference,
Screencast from 2026-03-18 14-47-24.webm

[agritheory]

I think it'd be better if we could preview in the normal PDF/image/etc preview pane, the same as any other doctype. I think the Vue component may be more trouble than its worth with this approach though.