fix: issue #20 cmd-J panel tab strip visibility and output panel parity

assets/css/shell.css

@@ -794,13 +794,3 @@
   padding: 16px;
 }
 
-.sidebar-header,
-.assistant-header,
-.panel-header {
-  display: flex;
-  justify-content: space-between;
-  gap: 12px;
-  padding: 16px 18px;
-  border-bottom: 1px solid var(--line);
-}
-

assets/js/hooks/app_shell.js

@@ -19,6 +19,7 @@ import {
 } from "../utils/shortcuts.js";
 import { syncTitlebarOverlayInsets } from "../bridges/titlebar_overlay.js";
 import { runMenuRuntimeCommand } from "../bridges/menu_runtime.js";
+import { copyTextToClipboard } from "../utils/clipboard.js";
 
 export const AppShell = {
   mounted() {
@@ -179,6 +180,10 @@ export const AppShell = {
       }
     });
 
+    this.handleEvent("clipboard", ({ text }) => {
+      copyTextToClipboard(text || "");
+    });
+
     window.addEventListener("bds:native-menu-action", this.handleNativeMenuAction);
     window.addEventListener("keydown", this.handleShortcutKeyDown, true);
     this.el.addEventListener("load", this.handleThumbnailLoad, true);

assets/js/utils/clipboard.js

@@ -0,0 +1,27 @@
+// Copies text to the system clipboard, mirroring the old app's behavior:
+// navigator.clipboard when available, with a hidden-textarea fallback for
+// webviews that lack the async clipboard API.
+export const copyTextToClipboard = async (text) => {
+  if (typeof navigator !== "undefined" && navigator.clipboard && typeof navigator.clipboard.writeText === "function") {
+    await navigator.clipboard.writeText(text);
+    return;
+  }
+
+  if (typeof document === "undefined" || typeof document.createElement !== "function") {
+    return;
+  }
+
+  const textArea = document.createElement("textarea");
+  textArea.value = text;
+  textArea.setAttribute("readonly", "");
+  textArea.style.position = "absolute";
+  textArea.style.left = "-9999px";
+  document.body.appendChild(textArea);
+  textArea.select();
+
+  if (typeof document.execCommand === "function") {
+    document.execCommand("copy");
+  }
+
+  document.body.removeChild(textArea);
+};