feat(tags): match add-tag modal to tauri design (preset swatches + active toggle)

- TagsSettingsPage modal: replace native color input with 4 preset
  swatches, add 'وضعیت برچسب' active toggle, update labels and submit
  button to mirror tauri AddPurchaseSubTabModal
- TenantTagController::create now honors an optional 'active' flag
  (defaults true, non-breaking for existing callers)
- tests: backend active-flag case, frontend preset-color + inactive case
- docs/api/tag.md: document the new create 'active' field

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/Tag/TenantTagTest.php

@@ -51,6 +51,24 @@ class TenantTagTest extends ApiTestCase
         self::assertCount(0, $after['data']);
     }
 
+    public function testCreateHonorsActiveFlag(): void
+    {
+        [$user] = $this->doctorUser();
+
+        // explicit active:false is persisted, not forced to the default true
+        $created = $this->authJson('POST', '/api/v1/tenant-tag', $user, [
+            'name' => 'بایگانی', 'color' => '#123456', 'active' => false,
+        ]);
+        self::assertSame(201, $this->responseCode());
+        self::assertFalse($created['data']['active']);
+
+        // omitting active still defaults to true
+        $default = $this->authJson('POST', '/api/v1/tenant-tag', $user, [
+            'name' => 'پیش‌فرض', 'color' => '#654321',
+        ]);
+        self::assertTrue($default['data']['active']);
+    }
+
     public function testRejectsInvalidNameAndColor(): void
     {
         [$user] = $this->doctorUser();