fix: resolve test failures for theme builder integration

- Replace hardcoded text-white and text-red-* with CSS variables in theme-editor
- Add theme-builder migration entry to housekeeping matrix
- Update legacy page counts from 137 to 138 in housekeeping tests
- Add /admin/theme-builder to content test prefixes

src/features/housekeeping/migration/content.ts

@@ -478,6 +478,31 @@ export const contentMigrationEntries: readonly MigrationEntry[] = [
 		localization: "PARTIAL",
 		accessibility: "PARTIAL",
 	}),
+	plannedContentEntry({
+		surface: "admin",
+		legacyPath: "/admin/theme-builder",
+		sourceFile: "src/app/admin/theme-builder/page.tsx",
+		targetPath: "/admin/content/brand/theme-builder",
+		decision: "REBUILD",
+		capabilities: {
+			read: [PERMS.SETTINGS_VIEW],
+			mutate: [PERMS.SETTINGS_EDIT],
+		},
+		dependencies: {
+			queries: ["ThemeScope", "ThemeScopeValue"],
+			mutations: [
+				"createScope",
+				"updateScope",
+				"deleteScope",
+				"saveScopeValues",
+				"resetScopeValues",
+				"duplicateScope",
+			],
+		},
+		auditRequirement: "PRIVILEGED_MUTATION",
+		localization: "NONE",
+		accessibility: "NONE",
+	}),
 	plannedContentEntry({
 		surface: "admin",
 		legacyPath: "/admin/favicon",