:zap: [Enhance] Switch dark mode with darkreader.js

:zap: [Enhance] Enable RangeNumber widget append and real-time update, generalize widget_id, and check existance before creating modal

:zap: [Enhance] [WIP] Dynamicly creating NewAgentModal

:zap: [Enhance] Prettify form formats of new agent modal, and auto resize system prompt input

:hammer: [WIP] NewAgentModal: Prettify with form-floating; need to auto height

:hammer: [WIP] New Agent Modal: Enable toggle button and prototype

:zap: [Enhance] New Agent button placeholder

:zap: [Enhance] Prettify dark theme

:gem: [Feature] New dark theme toggle button

:zap: [Enhance] Prettify icons and input placeholders

:zap: [Enhance] New v4 fa icons, sidebar toggle button icons and title, and reduce SIDEBAR_MAX_WIDTH

:gem: [Feature] New Chat Agents Sidebar

:zap: [Enhance] Correctly place components in main-container with d-flex css

:zap: [Enhance] Finetune margin and padding of messagers-container for screenshot

:zap: [Enhance] Re-positioning UI components

:zap: [Enhance] Modify placeholder of user input, and hide temperature select

:zap: [Enhance] Replace some bootstrap styles with pure css, and improve color palettes

:zap: [Enhance] Prettify UI by adding box-shadow and background-image linear-gradient

:zap: [Enhance] Confirm before clear chat history, toggle if add new point, and change icons

:gem: [Feature] New Buttons Binder: Add and toggle endpoint and api key items

:gem: [Feature] New ClearChatHistoryButtonBinder: clear chat history

:gem: [Feature] ChatHistoryStorer: render sidebar items

:gem: [Feature] New ChatHistoryStorer: save chat messages in browser with Dexie

:zap: [Enhance] Better button controls of sidebar, and memorize toggle preferences

:gem: [Feature] Responsive and adaptive chat-history-sidebar

:gem: [Feature] New sidebar component and toggle button with offcanvas mechanism

:zap: [Enhance] Replace cdn of common js with cdnjs.cloudflare.com

:gem: [Feature] Enable copy button for messages

:zap: [Enhance] Screenshot with proper padding

:gem: [Feature] Displayer: Expand content columns, and move role and button-group to hover

:boom: [Fix] Path of main.js in index.html

:recycle: [Refactor] Move default.css to css dir

:gem: [Feature] New favicon for web page

:zap: [Enhance] Only loading live.js in local server

:recycle: [Refactor] Re-organize file structure