feat(canvas): implement a cheatsheet for keyboard shortcuts

Author: 3xpyth0n

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The Ideon project follows the [Keep a Changelog](https://keepachangelog.com/en/1.1.0/) format
 and uses [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.5.1] - 2026-02-28
+
+### Added
+
+- Added a Command Palette (`Ctrl+P`) displaying all keyboard shortcuts in a searchable card grid, with a discreet hint button on the canvas.
+
 ## [0.5.0] - 2026-02-27
 
 ### Added