Fix "Back to today" button not reloading active tab data

e2e/app.spec.ts

@@ -280,6 +280,20 @@ test.describe('Task Manager App', () => {
             await page.click('#goTodayBtn');
             await expect(page.locator('#selectedDateDisplay')).toContainText('Today');
         });
+
+        test('should reload active tab data when returning to today', async ({ page }) => {
+            // Switch to habits tab
+            await page.click('[data-tab="habits"]');
+            await expect(page.locator('#habits-tab')).toBeVisible();
+            // Navigate to previous day
+            await page.click('#prevDayBtn');
+            await expect(page.locator('#selectedDateDisplay')).not.toContainText('Today');
+            // Return to today via button
+            await page.click('#goTodayBtn');
+            // The habits tab should still be active and showing today's data
+            await expect(page.locator('#selectedDateDisplay')).toContainText('Today');
+            await expect(page.locator('#habits-tab')).toBeVisible();
+        });
     });
 
     // ========================

src/app.ts

@@ -191,7 +191,12 @@ class TaskManager {
         document.getElementById('goTodayBtn')!.addEventListener('click', () => {
             this.selectedDate = new Date();
             this.updateDateNavigator();
-            this.render();
+            const activeTabName = (document.querySelector('.nav-tab.active') as HTMLElement | null)?.dataset.tab;
+            if (activeTabName) {
+                this.switchTab(activeTabName);
+            } else {
+                this.renderDashboard();
+            }
         });
     }