chore: clean up voice channel code for MVP

- Simplify message builder content_attributes handling
- Remove AI captain integration from incoming call service
- Clean up FloatingCallWidget by removing non-essential features:
  - Remove Gravatar/MD5 dependency
  - Remove keypad/DTMF functionality
  - Remove fullscreen toggle
  - Simplify avatar handling
- Apply consistent code formatting across voice components
- Remove debug logging and unused code

🤖 Generated with [Claude Code](https://claude.ai/code)

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

app/javascript/shared/components/FluentIcon/Icon.vue

@@ -32,28 +32,28 @@ export default {
       // To support icons with multiple paths
       const key = `${this.icon}-${this.type}`;
       const path = this.icons[key];
-      
+
       // If not found, try default icon
       if (path === undefined) {
         const defaultKey = `call-${this.type}`;
         const defaultPath = this.icons[defaultKey];
-        
+
         // If default icon also not found, return empty array to prevent errors
         if (defaultPath === undefined) {
           return [];
         }
-        
+
         if (Array.isArray(defaultPath)) {
           return defaultPath;
         }
-        
+
         return [defaultPath];
       }
-      
+
       if (Array.isArray(path)) {
         return path;
       }
-      
+
       return [path];
     },
   },