feat: enhance layer mask handling and opacity management

- Introduced `getLayerMask` utility to streamline layer mask retrieval.
- Updated layer rendering logic to incorporate layer masks and opacity adjustments.
- Added functionality to prevent dropping a group into its descendants.
- Enhanced image texture rendering to support opacity parameters across various rendering functions.
- Implemented group layer bounds application for better scaling and positioning.
- Added tests to ensure correct behavior when handling layer masks and group layers.
- Created new types for asset generation provenance to track generated assets more effectively.

commands/ids.ts

@@ -38,6 +38,7 @@ export const commandIds = {
   toolExitTemporaryPan: "tool.exitTemporaryPan",
   generationAddCandidate: "generation.addCandidate",
   generationSelectCandidate: "generation.selectCandidate",
+  generationSetCompareMode: "generation.setCompareMode",
   generationRemoveCandidate: "generation.removeCandidate",
   generationClearCandidates: "generation.clearCandidates",
   generationApplyCandidateAsLayer: "generation.applyCandidateAsLayer",