auth ux improvements + cloner fix

db.js

@@ -546,9 +546,14 @@ function cloneStructure(
   cloneDbs = [],
 ) {
   const transaction = db.transaction(() => {
+    // Carry over the source's head_injection (viewport meta, PWA tags, favicons,
+    // mobile-hardening CSS). Without this a clone renders unstyled/unscaled on
+    // mobile even though its templates are identical.
+    const source = getStructure(structId);
+
     const cloneStructure = db.prepare(`
-            INSERT INTO structures (name, user_id, route_prefix, cloned_from)
-            VALUES (?, ?, ?, ?);
+            INSERT INTO structures (name, user_id, route_prefix, cloned_from, head_injection)
+            VALUES (?, ?, ?, ?, ?);
         `);
 
     const newStructId = cloneStructure.run(
@@ -556,6 +561,7 @@ function cloneStructure(
       userId,
       routePrefix,
       structId,
+      source ? source.head_injection : null,
     ).lastInsertRowid;
 
     const dbIds = db