fix: various fixes to things + simply app proxy sentry setup

fluxer_app/src/lib/markdown/utils/TimestampValidation.test.tsx

@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2026 Fluxer Contributors
+ *
+ * This file is part of Fluxer.
+ *
+ * Fluxer is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Fluxer is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Fluxer. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import {getDateFromUnixTimestampSeconds} from '@app/lib/markdown/utils/TimestampValidation';
+import {describe, expect, test} from 'vitest';
+
+describe('getDateFromUnixTimestampSeconds', () => {
+	test('returns a valid date for normal unix timestamps', () => {
+		const result = getDateFromUnixTimestampSeconds(1618953630);
+
+		expect(result).toBeInstanceOf(Date);
+		expect(result?.toISOString()).toBe('2021-04-20T21:20:30.000Z');
+	});
+
+	test('returns null for infinity', () => {
+		expect(getDateFromUnixTimestampSeconds(Number.POSITIVE_INFINITY)).toBeNull();
+	});
+
+	test('returns null for NaN', () => {
+		expect(getDateFromUnixTimestampSeconds(Number.NaN)).toBeNull();
+	});
+
+	test('returns null when timestamp is beyond js date range', () => {
+		expect(getDateFromUnixTimestampSeconds(8640000000001)).toBeNull();
+	});
+});