- Introduce `RoleLabelDisplay` enum (inline, above, none) and integrate it into UI rendering and message formatting. - Replace `show_role_labels` boolean with `role_label_mode` across config, formatter, session, and TUI components. - Add `syntax_highlighting` boolean to UI settings with default `false` and support in message rendering. - Update configuration schema version to 1.3.0 and provide deserialization handling for legacy boolean values. - Extend theme definitions with code block styling fields (background, border, text, keyword, string, comment) and default values in `Theme`. - Adjust related modules (`formatting.rs`, `ui.rs`, `session.rs`, `chat_app.rs`) to use the new settings and theme fields.
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