feat: Update API versioning and parser handling for improved schedule updates and error management

src/App.tsx

@@ -61,8 +61,6 @@ import {
   subgroupsOf,
 } from "../shared/lessons";
 import qrcode from "qrcode-generator";
-/** Matches PARSER_VERSION on the server: older saved schedules are re-read once. */
-const SCHEMA_VERSION = 7;
 const SOURCE =
   "https://nextcloud.psu.by/index.php/s/no5zKbMrns6j5jQ?dir=/2026-2027";
 const DAYS = [
@@ -710,10 +708,8 @@ export default function App() {
     lastCheck.current = Date.now();
     const c = known === undefined ? await loadCatalog() : known;
     if (!c || !schedule) return;
-    const found = scheduleUpdate(schedule, c, group, {
-      dismissed: readDismissed(),
-      schemaVersion: SCHEMA_VERSION,
-    });
+    // A schedule read by an older parser than the server's (c.parserVersion) is re-read once.
+    const found = scheduleUpdate(schedule, c, group, { dismissed: readDismissed() });
     if (!found) return setUpdate(null);
     // activate() reports what changed for the group.
     if (found.changed) await loadFile(found.changed, false, group);

src/types.ts

@@ -61,4 +61,6 @@ export interface Catalog {
   year: string;
   currentYear?: boolean;
   expectedYear?: string;
+  /** The server's parser: saved schedules read by an older one are re-read (API 10+). */
+  parserVersion?: number;
 }