refactor: rename cs-ai-agent to agent-desk in SDK and related files

- Updated message types in support-host-bridge.ts to use agent-desk prefix.
- Added new agent-desk-sdk.min.js file with updated functionality.
- Removed old cs-ai-agent-sdk.min.js file.
- Modified build-sdk script to generate agent-desk-sdk.min.js.
- Changed scrollbar class names in main.scss from cs-ai-agent to agent-desk.

web/styles/main.scss

@@ -4,7 +4,7 @@
 $thumb: #cbd5e1;
 $thumb-hover: #94a3b8;
 
-.cs-ai-agent-scrollbar {
+.agent-desk-scrollbar {
   scrollbar-width: thin;
   scrollbar-color: $thumb transparent;
 
@@ -29,7 +29,7 @@ $thumb-hover: #94a3b8;
   }
 }
 
-.dark .cs-ai-agent-scrollbar {
+.dark .agent-desk-scrollbar {
   scrollbar-color: hsl(var(--border)) transparent;
 
   &::-webkit-scrollbar-thumb {