Greygreed Inventory Toolkit 2.5.10

Player-facing highlights
- Marked this release as the retail-stable Inventory Toolkit build for the GreyGreed Suite.
- Updated suite compatibility for AutoLoot-GreyGreed 1.5.10.
- Improved suite panel handoff behavior so Inventory Toolkit, AutoLoot, Vendor, and Loot History panels stay mutually exclusive.
- Preserved current Retail compatibility metadata and user-facing suite polish.
