refactor(MikrotikTools): improve server search input layout and styling for better usability

frontend/src/MikrotikTools.jsx

@@ -224,22 +224,26 @@ function MikrotikTools() {
                   : 'Выберите сервер, чтобы выполнять проверки через него.'}
               </div>
             </div>
-            <div className="col-auto" style={{ minWidth: 260 }}>
+            <div className="col-auto ms-auto d-print-none" style={{ minWidth: 260 }}>
-              <div className="input-group input-group-flat">
+              <div className="d-flex">
+                <div className="me-0 flex-grow-1">
+                  <div className="input-icon">
                     <input
                       type="text"
-                  className="form-control"
+                      className="form-control form-control-sm"
-                  placeholder="Поиск серверов по IP, DNS, провайдеру..."
+                      placeholder="Поиск серверов..."
                       value={serverSearch}
                       onChange={(e) => setServerSearch(e.target.value)}
                     />
-                <span className="input-group-text">
+                    <span className="input-icon-addon">
                       <IconSearch size={16} className="text-muted" />
                     </span>
                   </div>
                 </div>
               </div>
             </div>
+          </div>
+        </div>
         <div className="card-body">
           {isInitialLoading ? (
             <TableSkeleton rows={2} columns={2} />