Add Teams, disable Ferdium, refactor Hyprland

Enable teams-for-linux and disable ferdium in system modules; add both
to core packages. Simplify Hyprland configuration by using direct
settings for animations, window rules, env, exec‑once and hypridle.
Remove unused Microsoft Teams PWA entry.

hosts/default/system-modules.nix

@@ -55,6 +55,8 @@ _: {
     slack.enable = true; # Slack: team communication and collaboration tool
     tutanota.enable = true; # Tutanota: secure email client
     signal.enable = true; # Signal: secure messaging app
+    teams.enable = true; # Teams-for-linux: Unofficial Microsoft Teams client for Linux
+    ferdium.enable = false; # Ferdium: All your services in one place built by the community
 
     /*
     Productivity / Knowledge Management