feat(web): add CSS design system and vendored JS libraries

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

TaskTracker.Api/wwwroot/js/app.js

@@ -1,53 +1,2 @@
-import { initDashboard, refreshDashboard } from './pages/dashboard.js';
-import { initTasks } from './pages/tasks.js';
-import { initContext } from './pages/context.js';
-import { initMappings } from './pages/mappings.js';
-
-const pages = ['dashboard', 'tasks', 'context', 'mappings'];
-let currentPage = null;
-let refreshTimer = null;
-
-function navigate(page) {
-    if (!pages.includes(page)) page = 'dashboard';
-    if (currentPage === page) return;
-    currentPage = page;
-
-    // Update nav
-    document.querySelectorAll('.nav-link').forEach(link => {
-        link.classList.toggle('active', link.dataset.page === page);
-    });
-
-    // Show/hide pages
-    pages.forEach(p => {
-        document.getElementById(`page-${p}`).classList.toggle('hidden', p !== page);
-    });
-
-    // Load page content
-    const loaders = { dashboard: refreshDashboard, tasks: initTasks, context: initContext, mappings: initMappings };
-    loaders[page]?.();
-
-    // Auto-refresh for dashboard and context
-    clearInterval(refreshTimer);
-    if (page === 'dashboard' || page === 'context') {
-        refreshTimer = setInterval(() => loaders[page]?.(), 30000);
-    }
-}
-
-function onHashChange() {
-    const hash = location.hash.slice(2) || 'dashboard';
-    navigate(hash);
-}
-
-// Init
-document.querySelectorAll('.nav-link').forEach(link => {
-    link.addEventListener('click', (e) => {
-        e.preventDefault();
-        location.hash = link.getAttribute('href').slice(1);
-    });
-});
-
-window.addEventListener('hashchange', onHashChange);
-
-initDashboard();
-initTasks();
-onHashChange();
+// TaskTracker app.js — command palette, keyboard shortcuts, drag-and-drop wiring
+// Will be populated in later tasks