Improve the profile preview with "swipe up to view" and local cache optimization (#1096)

* Update the ProfilePreview to use a swipe-up to navigate

* Use the profile cache to optimize load performance

* Hack to align the header in the profile preview against the screen view

* Fix profiles cache logic to ensure cache is used

* Fix dark mode on profile preview

src/state/models/cache/profiles-view.ts

@@ -45,8 +45,6 @@ export class ProfilesCache {
   }
 
   overwrite(did: string, res: GetProfile.Response) {
-    if (this.cache.has(did)) {
-      this.cache.set(did, res)
-    }
+    this.cache.set(did, res)
   }
 }