Merge syntax-highlighting branch: add syntax highlighting and intra-line diff

- Syntax highlighting for markdown code blocks, read/write tool output
- Intra-line diff highlighting for edit tool with word-level inverse
- VS Code-style syntax colors in themes
- Fix Google provider FinishReason handling
- Upgrade @google/genai to 1.34.0

packages/coding-agent/CHANGELOG.md

@@ -2,12 +2,20 @@
 
 ## [Unreleased]
 
+### Added
+
+- **Syntax highlighting**: Added syntax highlighting for markdown code blocks, read tool output, and write tool content. Uses cli-highlight with theme-aware color mapping and VS Code-style syntax colors. ([#214](https://github.com/badlogic/pi-mono/pull/214) by [@svkozak](https://github.com/svkozak))
+
+- **Intra-line diff highlighting**: Edit tool now shows word-level changes with inverse highlighting when a single line is modified. Multi-line changes show all removed lines first, then all added lines.
+
 ### Fixed
 
 - **Gemini tool result format**: Fixed tool result format for Gemini 3 Flash Preview which strictly requires `{ output: value }` for success and `{ error: value }` for errors. Previous format using `{ result, isError }` was rejected by newer Gemini models. ([#213](https://github.com/badlogic/pi-mono/issues/213), [#220](https://github.com/badlogic/pi-mono/pull/220))
 
 - **Google baseUrl configuration**: Google provider now respects `baseUrl` configuration for custom endpoints or API proxies. ([#216](https://github.com/badlogic/pi-mono/issues/216), [#221](https://github.com/badlogic/pi-mono/pull/221) by [@theBucky](https://github.com/theBucky))
 
+- **Google provider FinishReason**: Added handling for new `IMAGE_RECITATION` and `IMAGE_OTHER` finish reasons. Upgraded @google/genai to 1.34.0.
+
 ## [0.23.3] - 2025-12-17
 
 ### Fixed