chore: initial commit of TaskTracker project

Existing ASP.NET API with vanilla JS SPA, WindowWatcher, Chrome extension, and MCP server.

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

TaskTracker.Api/wwwroot/js/components/modal.js

@@ -0,0 +1,33 @@
+const overlay = document.getElementById('modal-overlay');
+
+export function showModal(title, contentHtml, actions = []) {
+    overlay.innerHTML = `
+        <div class="modal">
+            <div class="modal-title">${title}</div>
+            <div class="modal-body">${contentHtml}</div>
+            <div class="modal-actions" id="modal-actions"></div>
+        </div>`;
+    const actionsEl = document.getElementById('modal-actions');
+    actions.forEach(({ label, cls, onClick }) => {
+        const btn = document.createElement('button');
+        btn.className = `btn ${cls || ''}`;
+        btn.textContent = label;
+        btn.addEventListener('click', async () => {
+            await onClick(overlay.querySelector('.modal'));
+            closeModal();
+        });
+        actionsEl.appendChild(btn);
+    });
+    overlay.classList.remove('hidden');
+    overlay.addEventListener('click', onOverlayClick);
+}
+
+export function closeModal() {
+    overlay.classList.add('hidden');
+    overlay.innerHTML = '';
+    overlay.removeEventListener('click', onOverlayClick);
+}
+
+function onOverlayClick(e) {
+    if (e.target === overlay) closeModal();
+}