add Brave Browser to persistent apps and Homebrew casks; remove Brave from default packages

modules/darwin/system/appearance.nix

@@ -8,11 +8,13 @@ in
     autohide = true;
     orientation = "bottom";
     persistent-apps = [
+      "/System/Applications/Launchpad.app"
       "/Applications/Vivaldi.app"
+      "/Applications/Brave Browser.app"
       "/Applications/Ghostty.app"
       "/Applications/Cursor.app"
+      "/Applications/Freelens.app"
       # Use the nixpkgs path to the app for apps installed via nix. This will automatically use the latest nix store path.
-      "/${pkgs.lens}/Applications/Lens.app"
       "/${pkgs.slack}/Applications/Slack.app"
       "/${pkgs.discord}/Applications/Discord.app"
       "/Applications/Spotify.app"