refactor(components): hoist property lists in model, sound and rigid-body

[willeastcott]

Summary

Third PR in the component-consistency series (follows #8878, #8879).

Model, sound and rigid-body each defined their property list inline inside initializeComponentData and duplicated it as a hand-written object literal in cloneComponent. This PR hoists each list to a module-level _properties array and drives both methods from it.

Behavior-preserving — each clone literal was verified against its init list before converting, and all special-case handling survives:

• model: clone skips material/materialAsset in the loop (the existing default-material/asset resolution logic below is untouched) and still shallow-copies mapping via extend. The post-addComponent model/mesh-instance/customAabb cloning is unchanged. Init order (which the original commented on) is preserved in the hoisted list.
• sound: slots are still converted back to plain option objects inside the loop; the other 7 properties matched 1:1.
• rigid-body: the only mechanical difference — linearFactor/angularFactor previously round-tripped through [x, y, z] arrays which init converted back to Vec3. The loop now passes the component's Vec3s directly; the component setters .copy() their input, so the end state is identical and nothing is aliased.

Also drops the unused legacy properties parameter from the three initializeComponentData overrides.

Testing

• Model component tests pass unchanged (15 passing, includes clone coverage)
• Full npm test suite passes (1817 passing)
• ESLint clean on changed files

Remaining PRs in the series

4. Animation system (isolated due to its post-add clone assignment)
5. Standardize beforeremove handler naming across all systems

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Refactors the model, sound, and rigid-body component systems to hoist their component property lists into module-level _properties arrays, using the shared list to drive both initializeComponentData and cloneComponent to avoid drift and duplication.

Changes:

• Hoisted inline property arrays to module-level _properties constants in model, sound, and rigid-body systems.
• Reworked cloneComponent implementations to build clone data from _properties (preserving special-case handling for model materials/mapping and sound slots).
• Removed the unused legacy properties parameter from the three initializeComponentData overrides.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/framework/components/sound/system.js	Hoists _properties, uses it for initialization and cloning; preserves slot option-object conversion during clone.
src/framework/components/rigid-body/system.js	Hoists _properties, uses it for initialization and cloning; clone now passes factor Vec3s directly.
src/framework/components/model/system.js	Hoists ordered _properties, uses it for initialization and cloning while preserving material/materialAsset special-casing and mapping shallow-copy.

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