css: rewrite css injection to use mainWindow to fix imports

src/bootstrap.js

@@ -42,10 +42,10 @@ const startCore = () => {
 
       bw.webContents.executeJavaScript(readFileSync(join(__dirname, 'mainWindow.js'), 'utf8')
         .replaceAll('<hash>', hash || 'custom')
-        .replaceAll('<notrack>', oaConfig.noTrack));
+        .replaceAll('<notrack>', oaConfig.noTrack)
+        .replace('<css>', oaConfig.css.replaceAll('`', '\\`').replaceAll('\\', '\\\\')));
 
       if (oaConfig.js) bw.webContents.executeJavaScript(oaConfig.js);
-      if (oaConfig.css) bw.webContents.insertCSS(oaConfig.css);
     });
   });
 

src/mainWindow.js

@@ -42,7 +42,8 @@ setInterval(() => {
 
 
 const el = document.createElement('style');
-el.appendChild(document.createTextNode(`[class^="socialLinks-"] + [class^="info-"] {
+el.appendChild(document.createTextNode(`<css>
+[class^="socialLinks-"] + [class^="info-"] {
   padding-right: 0;
 }