Refact/project (#189)

* refactor: cleanup project entry point
* refactor: remove unused
* refactor: folder restructure

client/src/common/context/CursorContext.jsx

@@ -0,0 +1,64 @@
+import React, { createContext, useCallback, useMemo, useState } from 'react';
+
+import { useLocalStorage } from '../hooks/useLocalStorage';
+
+export const CursorContext = createContext({
+  cursor: 0,
+  isCursorLocked: false,
+
+  setCursor: () => undefined,
+  moveCursorUp: () => undefined,
+  moveCursorDown: () => undefined,
+});
+
+export const CursorProvider = ({ children }) => {
+  const [cursor, setCursor] = useState(0);
+  const [_cursorLocked, _setCursorLocked] = useLocalStorage('isCursorLocked', 'locked');
+  const isCursorLocked = useMemo(() => _cursorLocked === 'locked', [_cursorLocked]);
+
+  const cursorLockedOff = useCallback(() => _setCursorLocked('unlocked'), [_setCursorLocked]);
+  const cursorLockedOn = useCallback(() => _setCursorLocked('locked'), [_setCursorLocked]);
+
+  const moveCursorUp = useCallback(() => {
+    setCursor((prev) => Math.max(prev - 1, 0));
+  }, []);
+
+  const moveCursorDown = useCallback(() => {
+    setCursor((prev) => prev + 1);
+  }, []);
+
+  /**
+   * @param {boolean | undefined} newValue
+   */
+  const toggleCursorLocked = useCallback(
+    (newValue = undefined) => {
+      if (typeof newValue === 'undefined') {
+        if (isCursorLocked) {
+          cursorLockedOff();
+        } else {
+          cursorLockedOn();
+        }
+      } else if (!newValue) {
+        cursorLockedOff();
+      } else if (newValue) {
+        cursorLockedOn();
+      }
+    },
+    [cursorLockedOff, cursorLockedOn, isCursorLocked]
+  );
+
+  return (
+    <CursorContext.Provider
+      value={{
+        cursor,
+        isCursorLocked,
+        toggleCursorLocked,
+        setCursor,
+        moveCursorUp,
+        moveCursorDown,
+      }}
+    >
+      {children}
+    </CursorContext.Provider>
+  );
+};