fix(cli): preserve stats cleanup lookback validation

- Parse the full inline lookback-days value before validation

src/cli/args.test.ts

@@ -420,6 +420,8 @@ test('hasExplicitCommand and shouldStartApp preserve command intent', () => {
     ]).statsCleanupLookbackDays,
     1,
   );
+  assert.equal(parseArgs(['--stats-cleanup-lookback-days=30']).statsCleanupLookbackDays, 30);
+  assert.throws(() => parseArgs(['--stats-cleanup-lookback-days=30=oops']), /at least one day/);
 
   const jellyfinLibraries = parseArgs(['--jellyfin-libraries']);
   assert.equal(jellyfinLibraries.jellyfinLibraries, true);

src/cli/args.ts

@@ -384,7 +384,9 @@ export function parseArgs(argv: string[]): CliArgs {
     else if (arg === '--stats-cleanup-duplicate-lines') args.statsCleanupDuplicateLines = true;
     else if (arg === '--stats-cleanup-dry-run') args.statsCleanupDryRun = true;
     else if (arg.startsWith('--stats-cleanup-lookback-days=')) {
-      args.statsCleanupLookbackDays = parseStatsCleanupLookbackDays(arg.split('=', 2)[1]);
+      args.statsCleanupLookbackDays = parseStatsCleanupLookbackDays(
+        arg.slice('--stats-cleanup-lookback-days='.length),
+      );
     } else if (arg === '--stats-cleanup-lookback-days') {
       args.statsCleanupLookbackDays = parseStatsCleanupLookbackDays(readValue(argv[i + 1]));
     } else if (arg.startsWith('--stats-response-path=')) {