Added nix files. revorked queue append, added library migration.

CHANGELOG.md

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+# Changelog
+
+All notable changes to Furumi are 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).
+
+## [Unreleased]
+
+## [0.2.5] - 2026-08-02
+
+### Added
+
+- Command history navigation with the Up and Down arrow keys.
+- A copy-friendly plain terminal view for connection tickets, device and Jam
+  invites, and track-sharing links.
+- A configurable permanent music directory with write validation and an
+  optional safe migration of existing Furumi-managed files.
+- Queue reordering for one track or a `Shift+V` selection with `Alt+K` and
+  `Alt+J`.
+- Reproducible Nix/devenv tooling with Rust 1.97 and ALSA development files,
+  plus automatic Rust 1.97 selection through `rust-toolchain.toml`.
+
+### Changed
+
+- Sequential `a` actions now build one ordered play-next block instead of
+  reversing independently inserted tracks.
+- Federated artist images and release covers are stored beside permanent music
+  in an `Artist/Release` directory tree.
+
+[Unreleased]: https://gt.hexor.cy/ab/furumi_tui/compare/v0.2.5...HEAD
+[0.2.5]: https://gt.hexor.cy/ab/furumi_tui/compare/v0.2.4...v0.2.5