add env var

openspec/changes/archive/2026-03-28-integrate-shadcn-library/tasks.md

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+## 1. Setup Environment
+
+- [x] 1.1 Install Tailwind CSS and its dependencies.
+- [x] 1.2 Configure Tailwind CSS in the project.
+- [x] 1.3 Initialize `shadcn/ui` in the project.
+
+## 2. Replace Components
+
+- [x] 2.1 Replace the `Dropdown` component with the `shadcn/ui` `Select` component.
+- [x] 2.2 Replace the `FilterBox` component with a combination of `shadcn/ui` components (e.g., `DropdownMenu` with `Checkbox`).
+
+## 3. Verification
+
+- [x] 3.1 Manually test the new components in the browser.