fix: execute Claude CLI commands through WSL on Windows

Resolves #137

Claude CLI commands (plugin list, MCP list, version check, etc.) were
being executed directly in Windows context where the `claude` binary
doesn't exist. This caused "program not found" errors across the UI.

Changes:
- Added `create_claude_command()` helper that automatically prefixes
  commands with `wsl` on Windows builds
- Updated 7 command functions to use the helper:
  - get_claude_version
  - list_plugins
  - install_plugin
  - uninstall_plugin
  - list_mcp_servers
  - enable_mcp_server
  - disable_mcp_server
- Added comprehensive tests for both Windows and Linux contexts

This ensures all Claude CLI commands execute in the correct WSL
context on Windows, fixing the memory pane, plugin pane, MCP servers
pane, and CLI version detection.

✨ This fix was created by Hikari~ 🌸

src-tauri/Cargo.lock

@@ -1636,7 +1636,7 @@ checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"
 
 [[package]]
 name = "hikari-desktop"
-version = "1.4.0"
+version = "1.5.0"
 dependencies = [
  "chrono",
  "dirs 5.0.1",