feat: on-page Download PDF opens Letter-size printable Study Load; drop pdf-lib/background path

background.js

@@ -1,47 +0,0 @@
-'use strict';
-
-function errMsg(err) {
-  return String((err && err.message) || err);
-}
-
-browser.runtime.onMessage.addListener((msg, sender, sendResponse) => {
-  if (msg && msg.type === 'scrape-study-load') {
-    browser.tabs.query({ active: true, currentWindow: true })
-      .then((tabs) => {
-        const tab = tabs[0];
-        if (!tab || tab.id == null) throw new Error('No active tab.');
-        return browser.tabs.sendMessage(tab.id, { type: 'scrape-study-load' });
-      })
-      .then((data) => sendResponse(data))
-      .catch((err) => sendResponse({ ok: false, error: errMsg(err) }));
-    return true;
-  }
-
-  if (msg && msg.type === 'generate-pdf') {
-    generatePdf(msg.data)
-      .then(() => sendResponse({ ok: true }))
-      .catch((err) => sendResponse({ ok: false, error: errMsg(err) }));
-    return true;
-  }
-});
-
-async function generatePdf(data) {
-  const bytes = await ISMIStools.buildStudyLoadPdf(data);
-  const blob = new Blob([bytes], { type: 'application/pdf' });
-  const url = URL.createObjectURL(blob);
-  const name = (data.header && data.header.fullName) || 'Student';
-  const filename = 'Study Load - ' + name + '.pdf';
-  try {
-    const id = await browser.downloads.download({ url, filename, saveAs: true });
-    const onChanged = (delta) => {
-      if (delta.id === id && delta.state && (delta.state.current === 'complete' || delta.state.current === 'interrupted')) {
-        browser.downloads.onChanged.removeListener(onChanged);
-        URL.revokeObjectURL(url);
-      }
-    };
-    browser.downloads.onChanged.addListener(onChanged);
-  } catch (err) {
-    URL.revokeObjectURL(url);
-    throw err;
-  }
-}