* fix: remove unnecessary websocket.js file and replace its usage directly in `WebSocketContext`
* fix: connect() doesn't need to be async
* fix: update WebSocket context import to use useWebSocket hook
* fix: use `useRef` for WebSocketContext
The main issue with using states was, previously the websocket never closed
properly on unmount, so multiple connections could be opened.
This was because the useEffect cleanup function was closing an old websocket
(that was initialized to null) instead of the current one.
We could have fixed this by adding `ws` to the useEffect dependency array, but
this was unnecessary since `ws` doesn't affect rendering so we shouldn't use a state.
* fix: replace `WebSocketContext` default value with null and add type definitions
* fix: add type definition for WebSocket URL and remove redundant protocol declaration
* fix: Prevent WebSocket reconnection attempts after unmount
Right now, when the WebSocketContext component unmounts,
there is still a pending reconnection attempt that tries
to reconnect the WebSocket after 3 seconds.
* refactor: Extract WebSocket URL construction into a separate function
* refactor: Centralize platform mode detection using IS_PLATFORM constant; use `token` from Auth context in WebSocket connection
* refactor: Use IS_PLATFORM constant for platform detection in authenticatedFetch function (backend)
* refactor: move IS_PLATFORM to config file for both frontend and backend
The reason we couldn't place it in shared/modelConstants.js is that the
frontend uses Vite which requires import.meta.env for environment variables,
while the backend uses process.env. Therefore, we created separate config files
for the frontend (src/constants/config.ts) and backend (server/constants/config.js).
* refactor: update import path for IS_PLATFORM constant to use config file
* refactor: replace `messages` with `latestMessage` in WebSocket context and related components
Why?
Because, messages was only being used to access the latest message in the components it's used in.
* refactor: optimize WebSocket connection handling with useCallback and useMemo
* refactor: comment out debug log for render count in AppContent component
* refactor(backend): update environment variable handling and replace VITE_IS_PLATFORM with IS_PLATFORM constant
* refactor: update WebSocket connection effect to depend on token changes for reconnection
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