v1.1.0: Add cancelled course, duplicate prevention, and credit bar ticks

- Mark "Managing Growing Companies" as cancelled with visual indicator and solver exclusion
- Prevent selecting duplicate courses across elective sets (e.g., same course in Spring and Summer)
- Add 2.5-credit interval tick marks to specialization progress bars
- Bump version to 1.1.0 with date display in UI header

app/src/data/courses.ts

@@ -110,6 +110,7 @@ export const COURSES: Course[] = [
   // === Summer Elective Set 2 ===
   {
     id: 'sum2-managing-growing', name: 'Managing Growing Companies', setId: 'sum2',
+    cancelled: true,
     qualifications: [
       { specId: 'ENT', marker: 'standard' }, { specId: 'LCM', marker: 'standard' },
       { specId: 'MGT', marker: 'standard' }, { specId: 'STR', marker: 'S1' },

app/src/data/lookups.ts

@@ -38,3 +38,15 @@ export const setIdByCourse: Record<string, string> = {};
 for (const course of COURSES) {
   setIdByCourse[course.id] = course.setId;
 }
+
+// Cancelled course IDs
+export const cancelledCourseIds = new Set(
+  COURSES.filter((c) => c.cancelled).map((c) => c.id),
+);
+
+// Course IDs indexed by course name (for detecting duplicates across sets)
+export const courseIdsByName: Record<string, string[]> = {};
+for (const course of COURSES) {
+  if (course.cancelled) continue;
+  (courseIdsByName[course.name] ??= []).push(course.id);
+}

app/src/data/types.ts

@@ -19,6 +19,7 @@ export interface Course {
   name: string;
   setId: string;
   qualifications: Qualification[];
+  cancelled?: boolean;
 }
 
 export interface Specialization {