fix(tui): swap user and AI message colors

User messages: #a8c4d4 (light blue) → #c0a480 (warm sand)
AI messages: #c0a480 (warm sand) → #a8c4d4 (light blue)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/cli/src/tui/theme.ts

@@ -1,6 +1,6 @@
 export const WARM_ACCENT = "#d4a070";
 export const WARM_MUTED = "#8f8374";
-export const WARM_REPLY = "#c0a480";
+export const WARM_REPLY = "#a8c4d4";
 export const WARM_BORDER = "#6b6156";
 
 // Semantic status colors
@@ -10,5 +10,5 @@ export const STATUS_ACTIVE = "#d4a76a";
 export const STATUS_IDLE = "#7a7268";
 
 // Role colors
-export const ROLE_USER = "#a8c4d4";
+export const ROLE_USER = "#c0a480";
 export const ROLE_SYSTEM = "#b8a8d0";