feat: enhance CLI with interactive mode, better UX, and robust error handling

- Integrated `clap` for structured argument parsing and `dialoguer` for an interactive fallback mode when arguments are missing.
- Added `anyhow` for contextual error handling and `colored` for improved terminal output (success, warnings, errors).
- Enhanced automatic detection for app version and public key, supporting both project root and `src-tauri` directory structures.
- Added support for both Tauri 1.0 (`tauri.updater.pubkey`) and 2.0 (`plugins.updater.pubkey`) configuration paths.
- Fixed a bug in `src-tauri/Cargo.toml` parsing and restored signature validation for non-DMG platforms.
- Added a guard to prevent generating an empty `latest.json` if no valid platforms are found.
- Bumped version to 0.4.0 and updated README.md and CHANGELOG.md to reflect new features.

Author: shayyz-code

CHANGELOG.md

@@ -4,7 +4,20 @@ All notable changes to this project are documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
-## [Unreleased]
+## [0.4.0] - 2026-04-27
+
+### Added
+
+- Interactive mode: prompts for missing arguments (`download_url_base`, `notes`) if they are not provided via CLI.
+- Enhanced CLI UX with colorized output (success, warnings, errors).
+- Structured argument parsing and help messages using `clap`.
+- Improved error handling with context using `anyhow`.
+
+### Changed
+
+- Refactored core logic to use modern CLI crates (`clap`, `anyhow`, `colored`).
+- Improved automatic detection of version and public key from both project root and `src-tauri` directories.
+- Support for both Tauri 1.0 (`tauri.updater.pubkey`) and 2.0 (`plugins.updater.pubkey`) configuration paths.
 
 ## [0.3.1] - 2026-04-27