fix(#338): Disable QuickCaptureWidget in production with Coming Soon

- Show Coming Soon placeholder in production for both widget versions
- Widget available in development mode only
- Added tests verifying environment-based behavior
- Use runtime check for testability (isDevelopment function vs constant)

Refs #338

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/web/src/components/dashboard/QuickCaptureWidget.tsx

@@ -3,8 +3,19 @@
 import { useState } from "react";
 import { Button } from "@mosaic/ui";
 import { useRouter } from "next/navigation";
+import { ComingSoon } from "@/components/ui/ComingSoon";
 
-export function QuickCaptureWidget(): React.JSX.Element {
+/**
+ * Check if we're in development mode (runtime check for testability)
+ */
+function isDevelopment(): boolean {
+  return process.env.NODE_ENV === "development";
+}
+
+/**
+ * Internal Quick Capture Widget implementation
+ */
+function QuickCaptureWidgetInternal(): React.JSX.Element {
   const [idea, setIdea] = useState("");
   const router = useRouter();
 
@@ -48,3 +59,27 @@ export function QuickCaptureWidget(): React.JSX.Element {
     </div>
   );
 }
+
+/**
+ * Quick Capture Widget (Dashboard version)
+ *
+ * In production: Shows Coming Soon placeholder
+ * In development: Full widget functionality
+ */
+export function QuickCaptureWidget(): React.JSX.Element {
+  // In production, show Coming Soon placeholder
+  if (!isDevelopment()) {
+    return (
+      <div className="bg-white rounded-lg shadow-sm border border-gray-200 p-6">
+        <ComingSoon
+          feature="Quick Capture"
+          description="Quickly jot down ideas for later organization. This feature is currently under development."
+          className="!p-0 !min-h-0"
+        />
+      </div>
+    );
+  }
+
+  // In development, show full widget functionality
+  return <QuickCaptureWidgetInternal />;
+}

apps/web/src/components/dashboard/__tests__/QuickCaptureWidget.test.tsx

@@ -0,0 +1,93 @@
+/**
+ * QuickCaptureWidget (Dashboard) Component Tests
+ * Tests environment-based behavior
+ */
+
+import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
+import { render, screen } from "@testing-library/react";
+import { QuickCaptureWidget } from "../QuickCaptureWidget";
+
+// Mock next/navigation
+vi.mock("next/navigation", () => ({
+  useRouter: (): { push: () => void } => ({
+    push: vi.fn(),
+  }),
+}));
+
+describe("QuickCaptureWidget (Dashboard)", (): void => {
+  beforeEach((): void => {
+    vi.clearAllMocks();
+  });
+
+  afterEach((): void => {
+    vi.unstubAllEnvs();
+  });
+
+  describe("Development mode", (): void => {
+    beforeEach((): void => {
+      vi.stubEnv("NODE_ENV", "development");
+    });
+
+    it("should render the widget form in development", (): void => {
+      render(<QuickCaptureWidget />);
+
+      // Should show the header
+      expect(screen.getByText("Quick Capture")).toBeInTheDocument();
+      // Should show the textarea
+      expect(screen.getByRole("textbox")).toBeInTheDocument();
+      // Should show the Save Note button
+      expect(screen.getByRole("button", { name: /save note/i })).toBeInTheDocument();
+      // Should show the Create Task button
+      expect(screen.getByRole("button", { name: /create task/i })).toBeInTheDocument();
+      // Should NOT show Coming Soon badge
+      expect(screen.queryByText("Coming Soon")).not.toBeInTheDocument();
+    });
+
+    it("should have a placeholder for the textarea", (): void => {
+      render(<QuickCaptureWidget />);
+
+      const textarea = screen.getByRole("textbox");
+      expect(textarea).toHaveAttribute("placeholder", "What's on your mind?");
+    });
+  });
+
+  describe("Production mode", (): void => {
+    beforeEach((): void => {
+      vi.stubEnv("NODE_ENV", "production");
+    });
+
+    it("should show Coming Soon placeholder in production", (): void => {
+      render(<QuickCaptureWidget />);
+
+      // Should show Coming Soon badge
+      expect(screen.getByText("Coming Soon")).toBeInTheDocument();
+      // Should show feature name
+      expect(screen.getByText("Quick Capture")).toBeInTheDocument();
+      // Should NOT show the textarea
+      expect(screen.queryByRole("textbox")).not.toBeInTheDocument();
+      // Should NOT show the buttons
+      expect(screen.queryByRole("button", { name: /save note/i })).not.toBeInTheDocument();
+      expect(screen.queryByRole("button", { name: /create task/i })).not.toBeInTheDocument();
+    });
+
+    it("should show description in Coming Soon placeholder", (): void => {
+      render(<QuickCaptureWidget />);
+
+      expect(screen.getByText(/jot down ideas for later organization/i)).toBeInTheDocument();
+    });
+  });
+
+  describe("Test mode (non-development)", (): void => {
+    beforeEach((): void => {
+      vi.stubEnv("NODE_ENV", "test");
+    });
+
+    it("should show Coming Soon placeholder in test mode", (): void => {
+      render(<QuickCaptureWidget />);
+
+      // Test mode is not development, so should show Coming Soon
+      expect(screen.getByText("Coming Soon")).toBeInTheDocument();
+      expect(screen.queryByRole("textbox")).not.toBeInTheDocument();
+    });
+  });
+});