Simplify notification badges, improve performance (#57)

Co-authored-by: Jon Staab <shtaab@gmail.com>

src/routes/spaces/[relay]/threads/+page.svelte

@@ -17,7 +17,6 @@
   import ThreadItem from "@app/components/ThreadItem.svelte"
   import ThreadCreate from "@app/components/ThreadCreate.svelte"
   import {decodeRelay} from "@app/core/state"
-  import {setChecked} from "@app/util/notifications"
   import {makeCommentFilter} from "@app/core/state"
   import {makeFeed} from "@app/core/requests"
   import {pushModal} from "@app/util/modal"
@@ -59,7 +58,6 @@
 
     return () => {
       feed.cleanup()
-      setChecked($page.url.pathname)
     }
   })
 </script>

src/routes/spaces/[relay]/threads/[id]/+page.svelte

@@ -22,7 +22,6 @@
   import CommentActions from "@app/components/CommentActions.svelte"
   import EventReply from "@app/components/EventReply.svelte"
   import {deriveEvent, decodeRelay} from "@app/core/state"
-  import {setChecked} from "@app/util/notifications"
 
   const {relay, id} = $page.params as MakeNonOptional<typeof $page.params>
   const url = decodeRelay(relay)
@@ -54,7 +53,6 @@
 
     return () => {
       controller.abort()
-      setChecked($page.url.pathname)
     }
   })
 </script>