PWI improvements (#3489)

* Enable home and feeds on the PWI

* Add global SigninDialog to drive useRequireAuth()

* Tweak desktop styles

* Make the logo in leftnav PWI a clickable home link

* Add label

* Improve dialog on web

* Fix query key

* Go to home after signout from settings screen

* Filter out feeds from the discover listing for logged out users which are known to break without auth

* Update profile header follow/subscribe to give signin prompt

* Show profile feeds tabs on pwi

* Add language selector to account creation footer and pwi left nav desktop

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Co-authored-by: dan <dan.abramov@gmail.com>

src/components/dialogs/Context.tsx

@@ -6,10 +6,12 @@ type Control = Dialog.DialogOuterProps['control']
 
 type ControlsContext = {
   mutedWordsDialogControl: Control
+  signinDialogControl: Control
 }
 
 const ControlsContext = React.createContext({
   mutedWordsDialogControl: {} as Control,
+  signinDialogControl: {} as Control,
 })
 
 export function useGlobalDialogsControlContext() {
@@ -18,9 +20,10 @@ export function useGlobalDialogsControlContext() {
 
 export function Provider({children}: React.PropsWithChildren<{}>) {
   const mutedWordsDialogControl = Dialog.useDialogControl()
+  const signinDialogControl = Dialog.useDialogControl()
   const ctx = React.useMemo<ControlsContext>(
-    () => ({mutedWordsDialogControl}),
-    [mutedWordsDialogControl],
+    () => ({mutedWordsDialogControl, signinDialogControl}),
+    [mutedWordsDialogControl, signinDialogControl],
   )
 
   return (