diff --git a/packages/loopover-ui-kit/src/components/sidebar.test.tsx b/packages/loopover-ui-kit/src/components/sidebar.test.tsx
new file mode 100644
index 0000000000..27d3fbc893
--- /dev/null
+++ b/packages/loopover-ui-kit/src/components/sidebar.test.tsx
@@ -0,0 +1,87 @@
+import { fireEvent, render, screen } from "@testing-library/react";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { SidebarProvider, useSidebar } from "./sidebar";
+
+// jsdom implements no window.matchMedia; SidebarProvider pulls it in via useIsMobile. Stub it desktop-shaped
+// (matches:false), the standard shadcn use-mobile test setup.
+beforeEach(() => {
+  vi.stubGlobal(
+    "matchMedia",
+    vi.fn(() => ({
+      matches: false,
+      media: "",
+      addEventListener: () => {},
+      removeEventListener: () => {},
+    })),
+  );
+});
+afterEach(() => vi.unstubAllGlobals());
+
+// #8305: SidebarProvider's global Cmd/Ctrl+B keydown handler used to toggle the sidebar (and preventDefault())
+// no matter what had focus — hijacking the browser-native Bold shortcut inside text fields. These pin the
+// isTyping() guard: the shortcut still works from non-editable targets, and is inert inside a form field or
+// contenteditable element (target's own text-editing keeps the native behavior).
+
+function StateProbe() {
+  const { open } = useSidebar();
+  return <span data-testid="sidebar-open">{open ? "open" : "closed"}</span>;
+}
+
+function setup() {
+  const utils = render(
+    <SidebarProvider>
+      <StateProbe />
+      <input data-testid="field-input" />
+      <textarea data-testid="field-textarea" />
+      <div data-testid="field-editable" />
+    </SidebarProvider>,
+  );
+  // jsdom does not derive `isContentEditable` from the contentEditable attribute, so define it explicitly to
+  // represent a real contenteditable element the way a browser reports it to the guard.
+  const editable = screen.getByTestId("field-editable");
+  Object.defineProperty(editable, "isContentEditable", {
+    value: true,
+    configurable: true,
+  });
+  return utils;
+}
+
+const openState = () => screen.getByTestId("sidebar-open").textContent;
+
+describe("SidebarProvider Cmd/Ctrl+B guard (#8305)", () => {
+  it("toggles the sidebar on Cmd/Ctrl+B from a non-editable target and prevents the default", () => {
+    setup();
+    const before = openState();
+    // fireEvent returns false when the event's default was prevented.
+    const notPrevented = fireEvent.keyDown(document.body, {
+      key: "b",
+      ctrlKey: true,
+    });
+    expect(notPrevented).toBe(false); // preventDefault() ran
+    expect(openState()).not.toBe(before); // state flipped
+  });
+
+  it("does not toggle and does not preventDefault when the target is an input/textarea/contenteditable", () => {
+    setup();
+    for (const id of ["field-input", "field-textarea", "field-editable"]) {
+      const before = openState();
+      const notPrevented = fireEvent.keyDown(screen.getByTestId(id), {
+        key: "b",
+        metaKey: true,
+      });
+      expect(notPrevented, id).toBe(true); // default NOT prevented — native Bold survives
+      expect(openState(), id).toBe(before); // sidebar unchanged
+    }
+  });
+
+  it("leaves an unrelated Cmd/Ctrl chord (not 'b') alone", () => {
+    setup();
+    const before = openState();
+    const notPrevented = fireEvent.keyDown(document.body, {
+      key: "k",
+      ctrlKey: true,
+    });
+    expect(notPrevented).toBe(true);
+    expect(openState()).toBe(before);
+  });
+});
diff --git a/packages/loopover-ui-kit/src/components/sidebar.tsx b/packages/loopover-ui-kit/src/components/sidebar.tsx
index 5d79a39b43..874b08ce29 100644
--- a/packages/loopover-ui-kit/src/components/sidebar.tsx
+++ b/packages/loopover-ui-kit/src/components/sidebar.tsx
@@ -30,6 +30,21 @@ const SIDEBAR_WIDTH_MOBILE = "18rem";
 const SIDEBAR_WIDTH_ICON = "3rem";
 const SIDEBAR_KEYBOARD_SHORTCUT = "b";
 
+/** Whether a keyboard event originates from a text field or contenteditable element, in which case a global
+ *  shortcut handler must not act (Cmd/Ctrl+B is the browser-native Bold inside editable text). Mirrors exactly
+ *  the `isTyping` guard apps/loopover-ui's keyboard-shortcuts.tsx and app-shell.tsx already apply to their own
+ *  global keydown handlers (#8305). */
+function isTyping(target: EventTarget | null): boolean {
+  if (!(target instanceof HTMLElement)) return false;
+  const tag = target.tagName;
+  return (
+    tag === "INPUT" ||
+    tag === "TEXTAREA" ||
+    tag === "SELECT" ||
+    target.isContentEditable
+  );
+}
+
 type SidebarContextProps = {
   state: "expanded" | "collapsed";
   open: boolean;
@@ -107,6 +122,10 @@ const SidebarProvider = React.forwardRef<
           event.key === SIDEBAR_KEYBOARD_SHORTCUT &&
           (event.metaKey || event.ctrlKey)
         ) {
+          // #8305: don't hijack the browser-native Cmd/Ctrl+B (Bold) while the user is typing in a text field
+          // or contenteditable element — return before preventDefault()/toggle, matching the other two global
+          // keydown handlers in this repo (keyboard-shortcuts.tsx, app-shell.tsx).
+          if (isTyping(event.target)) return;
           event.preventDefault();
           toggleSidebar();
         }