fix: stop styling selectable dialog selects as disabled

Override add-dock-dialog readonly input greying for t-select
inner inputs while keeping true readonly fields grey.

src/styles/prototype.css

@@ -720,6 +720,13 @@ svg:not(.t-icon){ width: 18px; height: 18px; fill: none; stroke: currentColor; s
 .add-dock-dialog .t-input:hover{ border-color: var(--line); }
 .add-dock-dialog .t-input--focused{ border-color: #6799d1; box-shadow: 0 0 0 3px rgba(31,111,235,.08); }
 .add-dock-dialog .t-input.t-is-readonly, .add-dock-dialog .t-input.t-is-readonly .t-input__inner{ color: #77838d; background: #f2f4f6; cursor: not-allowed; }
+/* Select 内部 input 默认 readonly，但不是禁用；恢复可交互外观 */
+.add-dock-dialog .t-select .t-input.t-is-readonly,
+.add-dock-dialog .t-select .t-input.t-is-readonly .t-input__inner {
+  color: var(--ink);
+  background: #fff;
+  cursor: pointer;
+}
 .add-dock-dialog .t-input.invalid, .add-dock-dialog .t-input.t-is-error{ border-color: var(--red); }
 .add-dock-dialog label small{ min-height: 0; color: var(--red); font-size: 10px; }
 .form-row{ display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }