chore(release): prepare for 3.0.0-alpha.12 (#531)

Author: cosmir17

CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [3.0.0-alpha.11] - 2025-11-20
+## [3.0.0-alpha.12] - 2025-11-21
 
 ### 🚀 Features
 
@@ -80,6 +80,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 - Always populate zswap_state for contract actions (#471)
 - Populate dust_generation_info from DustInitialUtxo events (#517)
 - *(chain-indexer)* Skip balance for failed contract actions (#527)
+- *(api)* DustGenerationStatus query returns zeros for some fields (#530)
 
 ### 💼 Other