Graphics: MSAA sample count setting capped at 4x by default #240

Current State

Device.MsaaSamples picks the highest supported count up to 64x (Device.Queries.cs:266-284): expensive on desktop and wasteful on tile-based mobile GPUs, where 4x is the sweet spot.

Tasks

• Add an MSAA sample-count setting to the render settings DataAsset, default 4x
• Clamp to the device maximum
• Unit test for the clamp

Acceptance Criteria

• Default is 4x; the setting is respected and clamped

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