Release version 2.0.0

- Bump version from 1.0.5 to 2.0.0 in Cargo.toml
- Add comprehensive CHANGELOG.md documenting major architectural changes
- Update dependencies including windows crate to 0.61.3
- Fix HWND parameter compatibility with windows-rs 0.61.3

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: bearice

CHANGELOG.md

@@ -0,0 +1,42 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [2.0.0] - 2025-07-08
+
+### Added
+- Dynamic menu system for extensible icon management
+- String-based icon system with automatic migration
+- Graceful thread shutdown functionality
+- About dialog with version and Git hash information
+- "Run on Start" option for automatic startup
+- Proper error handling for unsafe Windows API calls
+
+### Changed
+- **BREAKING**: Migrated to windows-rs crate for improved Windows API integration
+- **BREAKING**: Refactored main.rs into modular structure
+- Improved code quality and error handling throughout the application
+- Updated error messages to use eprintln! instead of println!
+
+### Fixed
+- Right-click context menu not showing in tray icon
+- Lifetime issues in App animation thread
+- CPU usage panic with proper error handling
+- Various compile errors and code formatting issues
+
+### Dependencies
+- Updated trayicon from 0.1.3 to 0.2.0
+- Updated winreg from 0.10.1 to 0.55.0
+- Migrated from older Windows API bindings to windows-rs 0.58
+
+## [1.0.5] - Previous Release
+
+### Added
+- Initial stable release with animated cat and parrot icons
+- CPU usage monitoring with animation speed correlation
+- Windows theme detection (light/dark)
+- Registry integration for settings persistence
+- Tray icon with context menu

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "rust_cat"
-version = "1.0.5"
+version = "2.0.0"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

Cargo.toml

@@ -8,7 +8,7 @@ use windows::{
 pub fn safe_message_box(message: &str, title: &str, flags: u32) -> std::result::Result<(), Box<dyn std::error::Error>> {
     unsafe {
         let result = MessageBoxW(
-            HWND::default(),
+            Some(HWND::default()),
             &HSTRING::from(message),
             &HSTRING::from(title),
             MESSAGEBOX_STYLE(flags),
@@ -23,7 +23,7 @@ pub fn safe_message_box(message: &str, title: &str, flags: u32) -> std::result::
 pub fn safe_shell_execute(file: &str) -> std::result::Result<(), Box<dyn std::error::Error>> {
     unsafe {
         let ret = ShellExecuteW(
-            HWND::default(),
+            Some(HWND::default()),
             None,
             &HSTRING::from(file),
             None,