Takendown state + in-app takedown appeals (#7566)

* takendown screen

* add form, move button inline

* expect type error

* display error

* disable submit if too long

* move around all the ctas

* typos, rm layoutanimation, fix link

* use REASONAPPEAL

src/state/session/index.tsx

@@ -258,7 +258,7 @@ export function Provider({children}: React.PropsWithChildren<{}>) {
     ],
   )
 
-  // @ts-ignore
+  // @ts-expect-error window type is not declared, debug only
   if (__DEV__ && isWeb) window.agent = state.currentAgentState.agent
 
   const agent = state.currentAgentState.agent as BskyAppAgent