feat(epub.js): add saving for settings of the font family to localstorage

cps/static/js/reading/epub.js

@@ -119,11 +119,16 @@ var reader;
     const theme = localStorage.getItem("calibre.reader.theme") ?? "lightTheme";
     selectTheme(theme);
 
-    // Restore saved font size after reader is ready
+    // Restore saved font and font size after reader is ready
     reader.book.ready.then(() => {
         const savedFontSize = localStorage.getItem("calibre.reader.fontSize");
         if (savedFontSize) {
             reader.rendition.themes.fontSize(`${savedFontSize}%`);
         }
+
+        const savedFont = localStorage.getItem("calibre.reader.font");
+        if (savedFont && window.selectFont) {
+            window.selectFont(savedFont);
+        }
     });
 })();

cps/templates/read.html

@@ -335,7 +335,7 @@
 
       let defaultFont;
 
-      function selectFont(id) {
+      window.selectFont = function (id) {
         if (!defaultFont) {
           defaultFont = reader.rendition.getContents()[0]?.css("font-family");
         }
@@ -346,12 +346,15 @@
         }
         document.getElementById(id).querySelector("span").textContent = "✓";
 
+        // Save font selection to localStorage
+        localStorage.setItem("calibre.reader.font", id);
+
         if (id == "default") {
           reader.rendition.themes.font(defaultFont);
           return;
         }
         reader.rendition.themes.font(id);
-      }
+      };
 
       function spread(id) {
         spans = document.getElementById("layout").querySelectorAll("span");