Merge pull request #2515 from AmbireTech/refactor/portfolio-hints-controller

Refactor/ Move hints logic from the portfolio to `HintsController`

Author: PetromirDev

src/controllers/AGENTS.md

@@ -121,6 +121,7 @@ ALWAYS update this list when creating a new controller, and provide a one-senten
 - **FeatureFlagsController** – Toggles application features at runtime for roll-outs and A/B testing.
 - **EstimationController** – Estimates gas, fees, and payment options for smart-account transactions.
 - **GasPriceController** – Fetches and formats gas-price recommendations and bundler gas speeds.
+- **HintsController** – Owns the portfolio's token/NFT hints (learned assets, to-be-learned assets, custom tokens, token preferences) and their storage; a sub-controller of the PortfolioController.
 - **InviteController** – Manages invite codes and OG status (legacy; now used for status tracking only).
 - **KeystoreController** – Encrypts seeds and private keys under a multi-secret–wrapped main key, manages unlock state, and routes signing to internal or hardware-backed keys.
 - **NetworksController** – Manages blockchain networks and their configuration