fix(xtream): guard against invalid timezone strings in catchup formatter

Intl.DateTimeFormat throws RangeError for non-IANA timezone values
(e.g. 'UTC+5', offset strings) that some Xtream servers return in
server_info.timezone. Wrap the formatter in a try-catch and fall back
to client local-time formatting on failure.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

libs/portal/xtream/data-access/src/lib/services/xtream-url.service.spec.ts

@@ -106,5 +106,20 @@ describe('XtreamUrlService', () => {
             const expected = `${date.getFullYear()}-${pad(date.getMonth() + 1)}-${pad(date.getDate())}:${pad(date.getHours())}-${pad(date.getMinutes())}`;
             expect(url).toContain(expected);
         });
+
+        it('falls back to client local time when an invalid timezone string is given', () => {
+            const url = service.constructCatchupUrl(
+                credentials,
+                101,
+                timestamp,
+                timestamp + 3600,
+                'rest',
+                'UTC+5'
+            );
+            const date = new Date(timestamp * 1000);
+            const pad = (n: number) => String(n).padStart(2, '0');
+            const expected = `${date.getFullYear()}-${pad(date.getMonth() + 1)}-${pad(date.getDate())}:${pad(date.getHours())}-${pad(date.getMinutes())}`;
+            expect(url).toContain(expected);
+        });
     });
 });

libs/portal/xtream/data-access/src/lib/services/xtream-url.service.ts

@@ -271,18 +271,22 @@ export class XtreamUrlService {
         const date = new Date(timestamp * 1000);
 
         if (timezone) {
-            const parts = new Intl.DateTimeFormat('en-CA', {
-                timeZone: timezone,
-                year: 'numeric',
-                month: '2-digit',
-                day: '2-digit',
-                hour: '2-digit',
-                minute: '2-digit',
-                hour12: false,
-            }).formatToParts(date);
-            const get = (type: Intl.DateTimeFormatPartTypes) =>
-                parts.find((p) => p.type === type)?.value ?? '00';
-            return `${get('year')}-${get('month')}-${get('day')}:${get('hour')}-${get('minute')}`;
+            try {
+                const parts = new Intl.DateTimeFormat('en-CA', {
+                    timeZone: timezone,
+                    year: 'numeric',
+                    month: '2-digit',
+                    day: '2-digit',
+                    hour: '2-digit',
+                    minute: '2-digit',
+                    hour12: false,
+                }).formatToParts(date);
+                const get = (type: Intl.DateTimeFormatPartTypes) =>
+                    parts.find((p) => p.type === type)?.value ?? '00';
+                return `${get('year')}-${get('month')}-${get('day')}:${get('hour')}-${get('minute')}`;
+            } catch {
+                // Invalid timezone string — fall through to local-time formatting
+            }
         }
 
         const pad = (value: number) => String(value).padStart(2, '0');