feat(v1.4.0): CSV/Excel/JSON/NextUp exports + hybrid smart year standing

- Export modules (export-csv/json/xlsx) mirroring the PDF layout, plus a
  Next Up import CSV matching the raycast/nextup column contract.
- Hybrid Year Level: View Grades history (exact per-semester standing),
  falling back to units math (prospectus total - lacking), then profile.
  Popup adds a year-mode setting (auto/custom/off).
- On-page button row now offers PDF / CSV / Excel / JSON / Next Up.
- Bump version to 1.4.0.
- Tag-only build workflow with an optional AMO sign step for a signed .xpi;
  separate ci.yml keeps tests on pushes/PRs.
- Tests: year-standing parser tests + export tests (CSV quoting, JSON schema,
  XLSX structure); CI validates XLSX via openpyxl.

parsers.js

@@ -81,6 +81,106 @@
       }));
   }
 
+  // ---- Year standing helpers ----
+
+  // Parse the View Grades page into an ordered list of academic terms:
+  //   [{ semester: 'FIRST'|'SECOND'|'SUMMER', year: 2024 }, ...]
+  // Terms appear in chronological order in the page. Regular semesters appear
+  // as "FIRST SEMESTER - YYYY"; summer appears as "SUMMER - YYYY".
+  function parseGradeHistory(html) {
+    const history = [];
+    const re = /\b(FIRST|SECOND)\s+SEMESTER\s*-\s*(\d{4})\b|\bSUMMER\s*-\s*(\d{4})\b/gi;
+    let m;
+    while ((m = re.exec(html)) !== null) {
+      if (m[1]) {
+        history.push({ semester: m[1].toUpperCase(), year: parseInt(m[2], 10) });
+      } else {
+        history.push({ semester: 'SUMMER', year: parseInt(m[3], 10) });
+      }
+    }
+    return history;
+  }
+
+  // Standing for the study load printed at (semester, year): it is the number
+  // of distinct academic years strictly before that term's year + 1. SUMMER of
+  // year Y is the same standing as the rest of year Y (the student has just
+  // finished the preceding level during Y's regular semesters). Clamped to at
+  // most the number of distinct years in history (a student cannot be past the
+  // final level recorded).
+  function yearLevelForSemester(history, year) {
+    if (!history || !history.length || !Number.isFinite(year)) return null;
+    const distinctYears = [...new Set(history.map((t) => t.year))].sort((a, b) => a - b);
+    const yearsBefore = distinctYears.filter((y) => y < year).length;
+    const level = Math.min(yearsBefore + 1, distinctYears.length);
+    return Number.isFinite(level) && level >= 1 ? level : null;
+  }
+
+  // Parse the Student Prospectus into per-year unit totals. Each table is
+  // preceded by a "Year Level: N" heading. Returns [{ year, units }].
+  function parseProspectusYearUnits(html) {
+    const segs = String(html || '').split(/(Year Level:\s*\d)/i);
+    const yearUnits = {};
+    let cur = null;
+    for (let i = 0; i < segs.length; i++) {
+      const s = segs[i];
+      const ym = /Year Level:\s*(\d+)/i.exec(s);
+      if (ym) { cur = parseInt(ym[1], 10); continue; }
+      if (cur == null) continue;
+      const tm = /<table[^>]*>([\s\S]*?)<\/table>/i.exec(s);
+      if (!tm) continue;
+      const rows = extractRows(tm[1]);
+      let units = 0;
+      for (const r of rows) {
+        if (r.length >= 3 && /^[A-Z]/.test(r[0]) && /[\d.]+/.test(r[2])) {
+          const u = parseFloat(String(r[2]).replace(/[^\d.]/g, ''));
+          if (Number.isFinite(u)) units += u;
+        }
+      }
+      yearUnits[cur] = (yearUnits[cur] || 0) + units;
+      cur = null; // only the immediately-following table belongs to this heading
+    }
+    const years = Object.keys(yearUnits).map(Number).sort((a, b) => a - b);
+    return years.map((y) => ({ year: y, units: yearUnits[y] }));
+  }
+
+  // Parse the Lacking Subjects page for total remaining units.
+  function parseLackingSubjectsUnits(html) {
+    return parseLackingSubjects(html).units;
+  }
+  function parseLackingSubjects(html) {
+    const rows = extractRows(String(html || ''));
+    let units = 0;
+    const courses = [];
+    for (const r of rows) {
+      if (r.length >= 3 && /^[A-Z]/.test(r[0]) && /[\d.]+/.test(r[2])) {
+        const u = parseFloat(String(r[2]).replace(/[^\d.]/g, ''));
+        if (Number.isFinite(u)) {
+          units += u;
+          courses.push({ courseCode: r[0], description: r[1], units: String(u) });
+        }
+      }
+    }
+    return { units: units.toFixed(2), courses };
+  }
+
+  // Year standing from units: finished = totalProspectusUnits - lackingUnits;
+  // standing = first N in [1..maxYear] where finished < cumulativeUnits(N);
+  // if finished passes every threshold, standing = maxYear (program length).
+  // yearUnits is the array [{year, units}] from parseProspectusYearUnits.
+  function computeYearStandingFromUnits(yearUnits, lackingUnits) {
+    const yrs = (yearUnits || []).slice().sort((a, b) => a.year - b.year);
+    if (!yrs.length) return null;
+    const total = yrs.reduce((s, y) => s + y.units, 0);
+    const finished = total - (parseFloat(lackingUnits) || 0);
+    if (finished < 0) return yrs[0].year;
+    let cum = 0;
+    for (const y of yrs) {
+      cum += y.units;
+      if (finished < cum) return y.year;
+    }
+    return yrs[yrs.length - 1].year; // passed everything -> final level
+  }
+
   function filterStudyLoadCourses(courses) {
     return (courses || []).filter(
       (c) => String(c.status || '').trim().toUpperCase() !== 'DISSOLVED'
@@ -93,5 +193,11 @@
       .toFixed(2);
   }
 
-  return { parseStudyLoadTable, parseProfilePage, parseOfferedCourses, filterStudyLoadCourses, sumUnits };
+  return {
+    parseStudyLoadTable, parseProfilePage, parseOfferedCourses,
+    filterStudyLoadCourses, sumUnits,
+    parseGradeHistory, yearLevelForSemester,
+    parseProspectusYearUnits, parseLackingSubjects, parseLackingSubjectsUnits,
+    computeYearStandingFromUnits
+  };
 });