Problem

TextRender editor bounds could be stale during prefab preview initialization. In prefab windows, this could make auto-fit run before text bounds were valid, so the same prefab appeared framed differently from a scene instance.

Solution

• Add a bounds-only update path for TextRender.
• Track bounds dirtiness separately from draw-data dirtiness.
• Keep HasContentLoaded() aligned with other actor types by checking asset load state, not material shader readiness.
• Make GetEditorBox(), GetLocalBox(), debug drawing, and intersection code refresh bounds when needed.
• Add a precise-hit-test fallback to bounding-box intersection when the collision proxy has not been built yet.
• Restrict prefab auto-fit waiting to content that can affect editor bounds, instead of overriding generic preview asset readiness.