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

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

@@ -0,0 +1,53 @@
+/*
+ * 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 {formatTimestamp} from '@app/lib/markdown/utils/DateFormatter';
+import {TimestampStyle} from '@fluxer/markdown_parser/src/types/Enums';
+import {setupI18n} from '@lingui/core';
+import {afterEach, describe, expect, test, vi} from 'vitest';
+
+const i18n = setupI18n({locale: 'en-US', messages: {'en-US': {}}});
+
+describe('formatTimestamp', () => {
+	afterEach(() => {
+		vi.useRealTimers();
+	});
+
+	test('returns the raw numeric value for non-finite timestamps', () => {
+		const output = formatTimestamp(Number.POSITIVE_INFINITY, TimestampStyle.ShortDateTime, i18n);
+
+		expect(output).toBe('Infinity');
+	});
+
+	test('returns the raw numeric value for out-of-range timestamps', () => {
+		const output = formatTimestamp(8640000000001, TimestampStyle.ShortDateTime, i18n);
+
+		expect(output).toBe('8640000000001');
+	});
+
+	test('still formats valid relative timestamps', () => {
+		vi.useFakeTimers();
+		vi.setSystemTime(new Date('2026-02-18T12:00:00.000Z'));
+
+		const oneMinuteAgoTimestamp = Math.floor(new Date('2026-02-18T11:59:00.000Z').getTime() / 1000);
+		const output = formatTimestamp(oneMinuteAgoTimestamp, TimestampStyle.RelativeTime, i18n);
+
+		expect(output.length).toBeGreaterThan(0);
+	});
+});