Add PDF export functionality and favicon support

- Introduced a new script for exporting the dashboard as a PDF using html2canvas and jsPDF.
- Added a favicon.ico file and linked it in the base template.
- Updated the base template to include the new PDF export script and modified the button for PDF export functionality.
- Enhanced the index template to include an ID for the dashboard content for PDF generation.

static/js/export-pdf.js

@@ -0,0 +1,111 @@
+/**
+ * Export dashboard as PDF by capturing a screenshot of #dashboard-content
+ * and assembling it into a multi-page PDF (html2canvas + jsPDF).
+ */
+function exportDashboardToPdf() {
+  var el = document.getElementById('dashboard-content');
+  if (!el) {
+    if (typeof console !== 'undefined' && console.warn) {
+      console.warn('export-pdf: #dashboard-content not found');
+    }
+    return;
+  }
+
+  var btn = document.getElementById('pdf-export-btn');
+  var originalText = btn ? btn.innerHTML : '';
+  if (btn) {
+    btn.disabled = true;
+    btn.innerHTML = 'Generating PDF…';
+  }
+
+  var regionEl = document.getElementById('regionBadge');
+  var region = regionEl ? (regionEl.textContent || '').trim() : '';
+
+  if (typeof html2canvas === 'undefined' || typeof jspdf === 'undefined') {
+    if (btn) {
+      btn.disabled = false;
+      btn.innerHTML = originalText;
+    }
+    alert('PDF export requires html2canvas and jsPDF. Please refresh the page.');
+    return;
+  }
+
+  var JsPDFConstructor = (typeof jspdf !== 'undefined' && jspdf.jsPDF) ? jspdf.jsPDF : jspdf;
+
+  var auditSection = el.querySelector('section[aria-label="Audit analysis"]');
+  var auditSectionDisplay = '';
+  if (auditSection) {
+    auditSectionDisplay = auditSection.style.display;
+    auditSection.style.display = 'none';
+  }
+
+  function restoreAuditSection() {
+    if (auditSection) {
+      auditSection.style.display = auditSectionDisplay;
+    }
+  }
+
+  html2canvas(el, {
+    scale: 2,
+    useCORS: true,
+    allowTaint: true,
+    logging: false
+  }).then(function(canvas) {
+    var imgW = canvas.width;
+    var imgH = canvas.height;
+    var dataUrl = canvas.toDataURL('image/png');
+
+    var doc = new JsPDFConstructor({ orientation: 'portrait', unit: 'mm', format: 'a4' });
+    var pageW = 210;
+    var pageH = 297;
+    var margin = 10;
+    var contentW = pageW - 2 * margin;
+    var headerH = 14;
+    var firstPageImgTop = margin + headerH;
+    var firstPageImgH = pageH - firstPageImgTop - margin;
+    var otherPageImgH = pageH - 2 * margin;
+
+    var imgWmm = contentW;
+    var imgHmm = contentW * (imgH / imgW);
+
+    doc.setFontSize(14);
+    doc.text('Dashboard report', margin, margin + 6);
+    doc.setFontSize(10);
+    doc.text(region ? 'Region: ' + region : '', margin, margin + 12);
+
+    var shown = 0;
+    var totalH = imgHmm;
+    var pageNum = 0;
+    var imgYmm = firstPageImgTop;
+
+    while (shown < totalH) {
+      if (pageNum > 0) {
+        doc.addPage();
+        imgYmm = margin;
+      }
+      var sliceH = pageNum === 0 ? firstPageImgH : otherPageImgH;
+      var yOffset = -shown;
+      doc.addImage(dataUrl, 'PNG', margin, imgYmm + yOffset, imgWmm, imgHmm);
+      shown += sliceH;
+      pageNum += 1;
+    }
+
+    doc.save('dashboard-report.pdf');
+
+    restoreAuditSection();
+    if (btn) {
+      btn.disabled = false;
+      btn.innerHTML = originalText;
+    }
+  }).catch(function (err) {
+    if (typeof console !== 'undefined' && console.error) {
+      console.error('export-pdf:', err);
+    }
+    restoreAuditSection();
+    if (btn) {
+      btn.disabled = false;
+      btn.innerHTML = originalText;
+    }
+    alert('Failed to generate PDF. Please try again.');
+  });
+}