feat: voice (STT & TTS) (#1)

[KM-509] [EMA][FE Demo] Update user view on ai response bubble chat

[KM-490 & KM-491][EMA][FE Demo] Migrate helper prompt to v2 API with data driven

fix: decode HTML entities in MarkmapRenderer so emojis render correctly

feat: replace typing indicator with random cycling phrases and simplify feedback widget

feat: improve UI components and chatbot configuration

Refactor API calls to direct backend integration, add chatbot configuration system, and improve UI components

[NOTICKET] Fixing backend url api

[NOTICKET] Fixing chat history for different user account

[KM-422] [EMA][FE] Interface prototype for External Demo

[KM-422] [EMA][FE] Interface prototype for External Demo