[🐴] Show if user can be messaged in new chat search (#4021)

* show if user can be messaged

* allow 2 lines in handle field due to new text

* cannot -> can't

* rework canBeMessaged logic and move to new file

---------

Co-authored-by: Eric Bailey <git@esb.lol>

src/components/dms/util.ts

@@ -0,0 +1,18 @@
+import {AppBskyActorDefs} from '@atproto/api'
+
+export function canBeMessaged(profile: AppBskyActorDefs.ProfileView) {
+  switch (profile.associated?.chat?.allowIncoming) {
+    case 'none':
+      return false
+    case 'all':
+      return true
+    // if unset, treat as following
+    case 'following':
+    case undefined:
+      return Boolean(profile.viewer?.followedBy)
+    // any other values are invalid according to the lexicon, so
+    // let's treat as false to be safe
+    default:
+      return false
+  }
+}