feat (ui): select files upgrade

app/static/styles.css

@@ -253,26 +253,69 @@ button.secondary {
 }
 
 .modal-card {
-  width: min(1100px, 96vw);
+  width: min(1400px, 90vw);
+  height: 80vh;
   background: #ffffff;
   border: 1px solid #d7dee9;
   border-radius: 10px;
   padding: 12px;
+  display: flex;
+  flex-direction: column;
+  min-height: 0;
 }
 
 .modal-head {
+  display: flex;
+  align-items: center;
   justify-content: space-between;
+  margin-bottom: 8px;
+}
+
+.modal-root-row {
+  margin-bottom: 8px;
 }
 
 .modal-grid {
   display: grid;
   grid-template-columns: 1fr 1fr;
   gap: 12px;
-  margin-top: 8px;
+  margin-top: 4px;
+  flex: 1;
+  min-height: 0;
 }
 
-.modal-grid .list {
-  max-height: 280px;
+.modal-pane {
+  display: flex;
+  flex-direction: column;
+  min-height: 0;
+}
+
+.modal-pane .list {
+  flex: 1;
+  min-height: 0;
+  max-height: none;
+}
+
+#modalFoldersList li,
+#modalFilesList li {
+  cursor: pointer;
+}
+
+.modal-files-tools {
+  margin-bottom: 8px;
+}
+
+.modal-files-tools input[type="text"] {
+  flex: 1;
+  min-width: 180px;
+}
+
+.modal-actions {
+  margin-top: 10px;
+  margin-bottom: 0;
+  justify-content: flex-end;
+  border-top: 1px solid #e4eaf2;
+  padding-top: 10px;
 }
 
 .settings-card {