Sidebar chat menu: add Delete, remove colour and icon pickers

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -3,6 +3,13 @@
 All notable changes to CodeCraft. Versions follow [Semantic Versioning](https://semver.org/);
 until 1.0, minor versions may contain breaking changes.
 
+## [Unreleased]
+
+### Changed
+
+- The chat menu in the sidebar has a **Delete** entry (with the question about the chat's own folder);
+  colour and icon selection moved out of it – they remain in the ⋯ menu inside the chat.
+
 ## [v202611-00037] – 2026-11-15
 
 ### Added