fix(app): broaden keyboard focus scope resolution to check multiple candidates

Check target, parentElement, and document.activeElement as focus
candidates instead of relying solely on the direct event target.
Fixes scope misdetection when the keyboard event target is a text
node or non-element.

packages/app/src/keyboard/focus-scope.ts

@@ -1,37 +1,77 @@
 import type { KeyboardFocusScope } from "@/keyboard/actions";
 
+function isElement(value: unknown): value is Element {
+  return typeof Element !== "undefined" && value instanceof Element;
+}
+
+function getFocusCandidateElements(target: EventTarget | null): Element[] {
+  const candidates: Element[] = [];
+  const pushUnique = (element: Element | null) => {
+    if (!element || candidates.includes(element)) {
+      return;
+    }
+    candidates.push(element);
+  };
+
+  if (isElement(target)) {
+    pushUnique(target);
+  }
+
+  if (typeof Node !== "undefined" && target instanceof Node) {
+    pushUnique(isElement(target.parentElement) ? target.parentElement : null);
+  }
+
+  if (typeof document !== "undefined" && isElement(document.activeElement)) {
+    pushUnique(document.activeElement);
+  }
+
+  return candidates;
+}
+
 export function resolveKeyboardFocusScope(input: {
   target: EventTarget | null;
   commandCenterOpen: boolean;
 }): KeyboardFocusScope {
   const { target, commandCenterOpen } = input;
-  if (!(target instanceof Element)) {
+  const candidates = getFocusCandidateElements(target);
+  if (candidates.length === 0) {
     return commandCenterOpen ? "command-center" : "other";
   }
 
-  if (target.closest("[data-testid='terminal-surface']") || target.closest(".xterm")) {
+  if (
+    candidates.some((element) =>
+      Boolean(element.closest("[data-testid='terminal-surface']") || element.closest(".xterm")),
+    )
+  ) {
     return "terminal";
   }
 
   if (
     commandCenterOpen &&
-    (target.closest("[data-testid='command-center-panel']") ||
-      target.closest("[data-testid='command-center-input']"))
+    candidates.some((element) =>
+      Boolean(
+        element.closest("[data-testid='command-center-panel']") ||
+          element.closest("[data-testid='command-center-input']"),
+      ),
+    )
   ) {
     return "command-center";
   }
 
-  if (target.closest("[data-testid='message-input-root']")) {
+  if (candidates.some((element) => Boolean(element.closest("[data-testid='message-input-root']")))) {
     return "message-input";
   }
 
-  const editable = target as HTMLElement;
-  if (editable.isContentEditable) {
-    return commandCenterOpen ? "command-center" : "editable";
-  }
-
-  const tag = target.tagName.toLowerCase();
-  if (tag === "input" || tag === "textarea" || tag === "select") {
+  if (
+    candidates.some((element) => {
+      const editable = element as HTMLElement;
+      if (editable.isContentEditable) {
+        return true;
+      }
+      const tag = element.tagName.toLowerCase();
+      return tag === "input" || tag === "textarea" || tag === "select";
+    })
+  ) {
     return commandCenterOpen ? "command-center" : "editable";
   }