feat(web): choose where the search sits, and controls no longer select text

- settings get a search position (left, center by default, right); the top bar
  is three zones and the suggestions open towards the free space
- buttons, chips, tabs, menu items and the home screen controls are not
  text-selectable, so clicks and double clicks no longer highlight labels

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/web/src/widgets/AppShell.module.css

@@ -31,10 +31,11 @@
 .top {
   grid-area: top;
   z-index: 30;
-  display: flex;
+  /* Три зоны: логотип, середина, профиль; поиск — в одной из них (настройка «Расположение поиска»). */
+  display: grid;
+  grid-template-columns: 1fr auto 1fr;
   align-items: center;
-  gap: 24px;
-  justify-content: space-between;
+  gap: 16px;
   padding: 0 20px;
   border-bottom: 1px solid var(--line);
   background: var(--bar-a);
@@ -53,9 +54,22 @@
   }
 }
 
+.topLeft {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  min-width: 0;
+}
+
+.topCenter {
+  display: flex;
+  justify-content: center;
+}
+
 .topRight {
   display: flex;
   align-items: center;
+  justify-content: flex-end;
   gap: 12px;
 }