[Auto] [Update] Document 3D orientation vectors, fix tween opacity 3D note

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This PR was automatically generated by the Update docs from GDevelop commits workflow.

An AI coding agent analysed recent commits in 4ian/GDevelop
and updated the documentation to reflect user-facing changes.

GDevelop commits covered

a28716d69 Add more hints on some actions
dd2ee4baa Add a hint that the Tween opacity action only works on 2D objects
100787f9e [Auto PR] Update translations (#8555)
c293911c8 Fix missing space in documentation generation and update types
18cd4f911 Add expressions to access the components of forward/up/right vectors of 3D objects (#8558)
5dd2b8ffd Add hints for some extensions, displayed in the documentation (#8564)
e6a5b70a2 Fix events locking up when dragging on mobile (#8563)
8e50ddefe Allow to configure object resources to be loaded independently from the scene (#8514)
c5c718354 Fix object dragging on mobile having a small delay (#8562)
f7012ebfd Fix created child objects instances in custom objects being picked twice (#8559)
e8fe23d9d Fix rendering of events true/false or yes/no as text when parameter not filled (#8561)
182fb12df Fix variable edition by AI wrongly erasing content of existing structure variables
1fc3e48ca Revert new basis expressions
b697245ea Fix wrong usage of THREE crash
e25265dc1 [Auto PR] Update translations (#8550)
cd9d5f3b0 Fix course video visibility (#8554)
840f0e93d Fix hot reloading for behaviors (#8553)
ab5866386 Add expressions to get object and camera local basis in the world basis (#8546)

The AI agent summary is:

Two documentation changes were made:

1. docs/gdevelop5/behaviors/tween/index.md: Added a note to the Opacity entry clarifying it only works on 2D objects and has no effect on 3D objects (matching the hint added in commit dd2ee4baa).

2. docs/gdevelop5/objects/3d-model/index.md: Added a new "Orientation vectors" section explaining the new forward/up/right vector expressions available on all 3D objects (via the Base 3D behavior) and the equivalent camera expressions, with practical use cases like moving objects in the direction they face (from commits 18cd4f911 and ab5866386).

Please review the changes carefully before merging.

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Project	Deployment	Actions	Updated (UTC)
gdevelop-wiki	Ready	Preview, Comment	May 5, 2026 9:00am