feat: close #94 installed chromium; silence Hyprland update-news

Re-boot of the offline install disk proves the residual #94 pass:
chromium on PATH, https/html mime → chromium-browser.desktop, and the
browser window actually opens. Kill ecosystem update-news / donation nag
so first boot is not Hyprland's "updated to …!" dialog.

modules/home/hyprland.nix

@@ -998,6 +998,15 @@ in
         background_color = rgb c.base;
       };
 
+      # First boot of every installed image was showing "Hyprland updated to
+      # 0.55.x!" over the themed desktop (V2 re-boot of the #94 install disk,
+      # 2026-07-15). That dialog is Hyprland's update-news popup, not our
+      # welcome toast — kill it so the first session is ours, not upstream's.
+      ecosystem = {
+        no_update_news = lib.mkDefault true;
+        no_donation_nag = lib.mkDefault true;
+      };
+
       # Window rules — float + center small config/utility dialogs that
       # tile awkwardly. Normal-priority list like `bind`/`exec-once` below,
       # so a downstream `windowrule = [...]` concatenates rather than