Many improvemtns and fixes related to decoupling of svelte and rust on android.

src/routes/login/+page.svelte

@@ -25,6 +25,13 @@
     connecting = true;
     localError = null;
 
+    // Reject plain HTTP — all connections must use HTTPS
+    if (serverUrl.trim().toLowerCase().startsWith("http://")) {
+      localError = "HTTP connections are not allowed. Please use HTTPS (e.g., https://your-server.com).";
+      connecting = false;
+      return;
+    }
+
     try {
       const info = await auth.connectToServer(serverUrl);
       serverName = info.name;