Implement EMBA Specialization Solver web app

Full React+TypeScript app with LP-based optimization engine,
drag-and-drop specialization ranking (with touch/arrow support),
course selection UI, results dashboard with decision tree, and
two optimization modes (maximize-count, priority-order).

app/src/data/lookups.ts

@@ -0,0 +1,40 @@
+import { COURSES } from './courses';
+import { ELECTIVE_SETS } from './electiveSets';
+import type { Course, Qualification } from './types';
+
+// Courses indexed by set ID
+export const coursesBySet: Record<string, Course[]> = {};
+for (const set of ELECTIVE_SETS) {
+  coursesBySet[set.id] = set.courseIds.map(
+    (cid) => COURSES.find((c) => c.id === cid)!
+  );
+}
+
+// Qualifications indexed by course ID
+export const qualificationsByCourse: Record<string, Qualification[]> = {};
+for (const course of COURSES) {
+  qualificationsByCourse[course.id] = course.qualifications;
+}
+
+// Course IDs indexed by specialization ID (with marker info)
+export const coursesBySpec: Record<string, { courseId: string; marker: Qualification['marker'] }[]> = {};
+for (const course of COURSES) {
+  for (const q of course.qualifications) {
+    if (!coursesBySpec[q.specId]) {
+      coursesBySpec[q.specId] = [];
+    }
+    coursesBySpec[q.specId].push({ courseId: course.id, marker: q.marker });
+  }
+}
+
+// Course lookup by ID
+export const courseById: Record<string, Course> = {};
+for (const course of COURSES) {
+  courseById[course.id] = course;
+}
+
+// Set ID lookup by course ID
+export const setIdByCourse: Record<string, string> = {};
+for (const course of COURSES) {
+  setIdByCourse[course.id] = course.setId;
+}