refactor(support): centralize ID-array normalization in toIntIds()

Consolidates the scattered `array_values(array_unique(array_map('intval',
$x)))` + manual positive-filter pattern behind a single lenient helper
`toIntIds(mixed $value): array` in core/Support/helpers/array.php.

- `RepositoryArrayHelper::sanitizePositiveIds()` now delegates (keeps
  strict array-input contract + existing tests intact).
- Drops two private duplicates: `UserProfileViewService::normalizeIds()`
  and `AddressBookService::normalizeIds()`.
- Replaces 12 inline occurrences across admin action pages with the
  helper, cutting boilerplate by 3-5 lines per site.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/Support/Helpers/ToIntIdsTest.php

@@ -0,0 +1,51 @@
+<?php
+
+namespace MintyPHP\Tests\Support\Helpers;
+
+use PHPUnit\Framework\TestCase;
+
+class ToIntIdsTest extends TestCase
+{
+    public function testDeduplicatesAndPreservesOrder(): void
+    {
+        $this->assertSame([1, 3, 5], toIntIds([1, 3, 5, 1, 3]));
+    }
+
+    public function testDropsNonPositiveValues(): void
+    {
+        $this->assertSame([2, 4], toIntIds([0, -1, 2, -3, 4]));
+    }
+
+    public function testCoercesNumericStrings(): void
+    {
+        $this->assertSame([1, 2, 3], toIntIds(['1', '2', '3']));
+    }
+
+    public function testIgnoresNonNumericStrings(): void
+    {
+        $this->assertSame([7], toIntIds(['abc', '7', '']));
+    }
+
+    public function testEmptyArrayReturnsEmpty(): void
+    {
+        $this->assertSame([], toIntIds([]));
+    }
+
+    public function testNullAndEmptyStringReturnEmpty(): void
+    {
+        $this->assertSame([], toIntIds(null));
+        $this->assertSame([], toIntIds(''));
+    }
+
+    public function testScalarIsWrappedAsSingleElement(): void
+    {
+        $this->assertSame([42], toIntIds(42));
+        $this->assertSame([42], toIntIds('42'));
+    }
+
+    public function testZeroScalarReturnsEmpty(): void
+    {
+        $this->assertSame([], toIntIds(0));
+        $this->assertSame([], toIntIds('0'));
+    }
+}