* fix: restore telemetry in App.tsx

* style: update AuthDialog.scss for improved modal background and backdrop effects

- Added a semi-transparent background color and blur effect to the modal backdrop for enhanced visual appeal.
- Overrode the Excalidraw already overriden background styles to ensure consistent appearance across the application.

- Introduced a new `devMode` property in the app configuration, allowing for conditional initialization of PostHog analytics based on the development environment.
- Updated the App component to check for `devMode` before initializing PostHog, enhancing control over analytics in development settings.
- Modified the AppConfig interface to include the new `devMode` boolean property for type safety.

* refactor: remove debug log from useAppConfig hook

- Removed the console log statement for 'data' in the useAppConfig hook to clean up the code and improve performance.

* refactor: clean up index.tsx by removing commented-out code

- Removed commented-out PostHogProvider and related code to streamline the index.tsx file.
- Ensured the StrictMode wrapper is correctly applied around the QueryClientProvider and application components for better performance and debugging.

* refactor: clean up import statement in AuthGate.tsx

- Removed unnecessary comment from the import statement for useAppConfig to improve code clarity.

* refactor: simplify handleOnScrollChange function in App component

- Updated the handleOnScrollChange function to remove unnecessary parameters, enhancing code clarity and maintainability.

* chore: add TypeScript types for React and ReactDOM

- Added `@types/react` and `@types/react-dom` as devDependencies in package.json for improved TypeScript support.
- Updated yarn.lock to include the new type definitions and their dependencies.

* refactor: remove hover styles from dropdown menu button in Excalidraw overrides

- Eliminated hover background color styles for the dropdown menu button in the _excalidraw-overrides.scss file to streamline the CSS and improve maintainability.

* refactor: update AuthDialog component and styles

- Removed unnecessary comment from AuthDialog.scss to streamline the styles.
- Changed the type of `warningText` prop in AuthDialog from string to React.ReactNode for better flexibility in rendering content.

* refactor: reorganize imports and enhance MainMenu component

- Moved the import statements for AccountDialog and MainMenu.scss to improve code organization.
- Added spacing for better readability in the MainMenu.tsx file.

* feat: add default CSS variables for consistent styling

- Introduced a new _defaults.scss file to define CSS variables for slider and range track styles.
- Updated index.scss to include the new defaults for improved styling consistency across components.

* refactor: remove CSS variables from Range.scss for cleaner styling

- Eliminated default CSS variables for slider and range track styles from Range.scss to streamline the styling process.
- Added appearance property to the range input for improved cross-browser compatibility.

* refactor: clean up imports in TabContextMenu component

- Removed unused useState import from TabContextMenu.tsx to enhance code clarity and reduce unnecessary dependencies.

* refactor: improve tab title reference assignment in Tabs component

- Updated the ref assignment for tab titles to use a block statement for better readability and consistency in the Tabs.tsx file.

* refactor: enhance type safety in Collab component

- Updated the type casting for user_id in the Collab component to ensure proper type handling of SocketId, improving code reliability and clarity.

* refactor: update App and MainMenu components for settings management

- Removed unused state and handlers related to the SettingsDialog in App.tsx to streamline the component.
- Added state management and conditional rendering for SettingsDialog in MainMenu.tsx, enhancing user experience and functionality.

* refactor: introduce UserSettings type and update constants

- Added UserSettings interface in a new types.ts file to define user settings structure.
- Introduced DEFAULT_SETTINGS constant in constants.ts for default user settings.
- Updated imports in SettingsDialog and canvas files to reference the new constants and types, enhancing code organization and type safety.

* refactor: clean up App component by removing unused settings-related code

- Removed commented-out imports, state, and handlers related to SettingsDialog in App.tsx to streamline the component and improve code clarity.

* refactor: clean up useless comments

* refactor: remove DevTools component and related styles

- Deleted the DevTools component and its associated SCSS file to streamline the codebase.
- Updated the CustomEmbeddableRenderer to remove references to DevTools, enhancing clarity and maintainability.
- Removed DevTools entry from the pad index file and MainMenu, simplifying the user interface.