Changelog: bubbles, chat icons, colour tags

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

CHANGELOG.md

@@ -3,6 +3,22 @@
 All notable changes to CodeCraft. Versions follow [Semantic Versioning](https://semver.org/);
 until 1.0, minor versions may contain breaking changes.
 
+## [Unreleased]
+
+### Added
+
+- **Chat bubbles:** your messages on the right in their own colour (the chat's colour tag if it
+  has one), the agent's answers on the left; tool-only steps and system notes stay without bubble.
+- **Icons for chats:** pick one of 22 icons in the ⋯ menu (chat and session list); it shows in the
+  list, the top bar and the project page, in the chat's colour, and is part of the project default.
+
+### Changed
+
+- **Colour tags are more vivid and more distinct:** eight fixed hues (new: pink), drawn with a
+  lightness that fits the theme (light/dark) and the highest chroma sRGB allows, so no two tags
+  look alike; backgrounds are tinted more strongly. Browsers without relative colours keep the
+  theme's own colours.
+
 ## [v202611-00026] – 2026-11-14
 
 ### Added