Add kawaii mode (#3773)

src/state/preferences/kawaii.tsx

@@ -0,0 +1,50 @@
+import React from 'react'
+
+import {isWeb} from '#/platform/detection'
+import * as persisted from '#/state/persisted'
+
+type StateContext = persisted.Schema['kawaii']
+
+const stateContext = React.createContext<StateContext>(
+  persisted.defaults.kawaii,
+)
+
+export function Provider({children}: React.PropsWithChildren<{}>) {
+  const [state, setState] = React.useState(persisted.get('kawaii'))
+
+  const setStateWrapped = React.useCallback(
+    (kawaii: persisted.Schema['kawaii']) => {
+      setState(kawaii)
+      persisted.write('kawaii', kawaii)
+    },
+    [setState],
+  )
+
+  React.useEffect(() => {
+    return persisted.onUpdate(() => {
+      setState(persisted.get('kawaii'))
+    })
+  }, [setStateWrapped])
+
+  React.useEffect(() => {
+    // dumb and stupid but it's web only so just refresh the page if you want to change it
+
+    if (isWeb) {
+      const kawaii = new URLSearchParams(window.location.search).get('kawaii')
+      switch (kawaii) {
+        case 'true':
+          setStateWrapped(true)
+          break
+        case 'false':
+          setStateWrapped(false)
+          break
+      }
+    }
+  }, [setStateWrapped])
+
+  return <stateContext.Provider value={state}>{children}</stateContext.Provider>
+}
+
+export function useKawaiiMode() {
+  return React.useContext(stateContext)
+}