Graphics: lazily allocated transient attachments #282

Current State

Per-swapchain color and depth images use TransientAttachmentBit but never LazilyAllocated memory (SwapChain.Resources.cs:291, 312-315, 404-407), wasting memory on tile GPUs.

Tasks

• Prefer a LazilyAllocated memory type for transient attachments when available

Acceptance Criteria

• Memory saving measured on the Galaxy S24 FE; desktop unchanged

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