refactor(web-ui): Apply modular structure and refactor dashboard

This commit applies the modular refactoring to the web-ui,
including the new daily attendance tracking feature.

- **Modular Structure:** Re-introduced the modular files 'config.js',
  'component-loader.js', and 'navigation.js' to centralize configuration,
  component loading, and navigation logic.
- **Refactored Dashboard:** Refactored 'group-leader-dashboard.js' to use
  the new 'apiCall' function from 'api-config.js' for API requests,
  removing duplicated code and improving error handling.
- **ES6 Modules:** Updated 'group-leader.html' to load scripts as
  ES6 modules ('type="module"'), ensuring compatibility with the
  modular JavaScript files.
- **Clean-up:** Removed unnecessary global variables and duplicated
  functions, improving code quality and maintainability.

update-logs/updates.md

@@ -0,0 +1,19 @@
+# 업데이트 로그
+
+## 2026-01-06
+
+### feat(web-ui): Refactor web-ui for improved maintainability and modularity
+
+-   **Commit:** `b4037c9395da89271c82285e9284f4c37aa66296`
+-   **Author:** Hyungi Ahn <hyungiahn@Hyungiui-MacBookPro.local>
+-   **Date:** Tue Jan 6 15:54:49 2026 +0900
+
+**Description:**
+
+This commit introduces a series of refactoring changes to the web-ui to remove hardcoded values and improve page integration.
+
+-   **Centralized Configuration:** Created `web-ui/js/config.js` to centralize API ports, paths, and navigation URLs, replacing hardcoded values across multiple files.
+-   **Modular Component Loading:** Introduced `web-ui/js/component-loader.js` to handle dynamic loading of common HTML components (e.g., sidebar, navbar), using paths from `config.js`.
+-   **Modular Navigation:** Created `web-ui/js/navigation.js` to centralize page redirection logic, improving maintainability and reducing direct `window.location.href` manipulations.
+-   **Refactored Existing Modules:** Updated `web-ui/js/api-config.js`, `web-ui/js/login.js`, `web-ui/js/load-sidebar.js`, and `web-ui/js/load-navbar.js` to utilize the new `config`, `component-loader`, and `navigation` modules.
+-   **ES6 Module Compatibility:** Ensured `web-ui/index.html` loads scripts as ES6 modules (`type="module"`) to support `import` statements.