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/vite.config.ts

@@ -6,7 +6,8 @@ import react from '@vitejs/plugin-react'
 export default defineConfig({
   plugins: [react()],
   define: {
-    __APP_VERSION__: JSON.stringify('1.0.0'),
+    __APP_VERSION__: JSON.stringify('1.1.0'),
+    __APP_VERSION_DATE__: JSON.stringify('2026-03-13'),
   },
   server: {
     allowedHosts: ['soos'],