Fix PDF ligature rendering - replace Unicode ligatures with ASCII

jsPDF's standard Times font doesn't support Unicode ligature characters
(fi, fl, ff, ffi, ffl). These rendered as "û" with extra spacing, breaking
words like "official" → "oû cial" and "conflict" → "conû ict".

Added replaceLigatures() function to convert ligatures to their
component letters (fi, fl, ff, etc.) before adding text to the PDF.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: jeremymanning

checklist.js

@@ -513,6 +513,19 @@ function emailChecklist() {
   generateChecklistPDF(dateInput.value);
 }
 
+// Replace Unicode ligatures with their component letters
+// jsPDF's standard fonts don't support ligature characters
+function replaceLigatures(text) {
+  return text
+    .replace(/\uFB00/g, 'ff')   // ff
+    .replace(/\uFB01/g, 'fi')   // fi
+    .replace(/\uFB02/g, 'fl')   // fl
+    .replace(/\uFB03/g, 'ffi')  // ffi
+    .replace(/\uFB04/g, 'ffl')  // ffl
+    .replace(/\uFB05/g, 'st')   // ſt (long s + t)
+    .replace(/\uFB06/g, 'st');  // st (s + t)
+}
+
 // Generate PDF using jsPDF library
 function generateChecklistPDF(dateValue) {
   // Check if jsPDF is available
@@ -579,6 +592,9 @@ function createPDF(dateValue) {
     var isChecked = checkboxes[index] && checkboxes[index].checked;
     var text = label.textContent.trim();
 
+    // Replace ligatures that jsPDF can't render properly
+    text = replaceLigatures(text);
+
     // Wrap text to content width (leave room for checkbox)
     var wrappedLines = doc.splitTextToSize(text, contentWidth - 10);