test(dashboard): add SPA screenshot and console error monitoring scripts

- capture-dashboard-tabs.cjs: Playwright script to capture all 6 dashboard tabs
- console-error-dashboard.cjs: Console + network error monitor with tab switching
- both scripts run via docker/docker-compose.web-testing.yml Playwright container
- zero console errors and zero network errors verified across all tabs

tests/scripts/console-error-dashboard.cjs

@@ -0,0 +1,51 @@
+#!/usr/bin/env node
+/**
+ * Console error monitor for dashboard SPA — clicks all tabs
+ */
+const { chromium } = require('playwright');
+const fs = require('fs');
+const path = require('path');
+
+const TARGET_URL = process.env.TARGET_URL || 'http://host.docker.internal:3003';
+const REPORTS_DIR = process.env.REPORTS_DIR || path.join(__dirname, '..', 'reports');
+
+(async () => {
+  const browser = await chromium.launch({ headless: true, args: ['--no-sandbox'] });
+  const context = await browser.newContext({ viewport: { width: 1280, height: 720 } });
+  const page = await context.newPage();
+  const consoleErrors = [];
+  const networkErrors = [];
+
+  page.on('console', msg => {
+    if (msg.type() === 'error' && !msg.text().includes('favicon')) consoleErrors.push(msg.text());
+  });
+  page.on('requestfailed', req => {
+    const url = req.url();
+    if (!url.includes('favicon')) networkErrors.push(url + ' | ' + req.failure().errorText);
+  });
+
+  console.log('Console error check for', TARGET_URL);
+  await page.goto(TARGET_URL, { waitUntil: 'domcontentloaded', timeout: 30000 });
+  await page.waitForTimeout(2000);
+
+  for (const tab of ['overview','agents','history','recommendations','heatmap','impact']) {
+    await page.click(`button[onclick="switchTab('${tab}')"]`);
+    await page.waitForTimeout(1000);
+  }
+
+  await page.waitForTimeout(1000);
+  await browser.close();
+
+  console.log('');
+  console.log('═════════════════════════════════════════');
+  console.log('  Console Error Monitor — Dashboard');
+  console.log('═════════════════════════════════════════');
+  console.log('  Console errors:', consoleErrors.length);
+  console.log('  Network errors:', networkErrors.length);
+  if (consoleErrors.length > 0) consoleErrors.forEach(e => console.log('  ', e.slice(0, 120)));
+  if (networkErrors.length > 0) networkErrors.forEach(e => console.log('  NET', e.slice(0, 120)));
+  console.log('═════════════════════════════════════════');
+
+  fs.mkdirSync(REPORTS_DIR, { recursive: true });
+  fs.writeFileSync(path.join(REPORTS_DIR, 'console-errors-dashboard.json'), JSON.stringify({ url: TARGET_URL, consoleErrors, networkErrors, timestamp: new Date().toISOString() }, null, 2));
+})();