Test infra: shared accessibility IDs + PageObjects + AAA_SeedTests

Ports iOS HoneyDueUITests AccessibilityIdentifiers + PageObjects pattern
to Android Compose UI Test. Kotlin AccessibilityIds object mirrors Swift
verbatim so scripts/verify_test_tag_parity.sh can gate on divergence.

AAA_SeedTests bracketed first alphanumerically; SuiteZZ cleanup to follow.

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

composeApp/src/androidInstrumentedTest/kotlin/com/tt/honeyDue/fixtures/TestUser.kt

@@ -0,0 +1,48 @@
+package com.tt.honeyDue.fixtures
+
+import kotlin.random.Random
+
+/**
+ * Test user fixture mirroring `TestFixtures.TestUser` in Swift.
+ *
+ * `seededTestUser()` yields the known-good backend account that
+ * `AAA_SeedTests` ensures exists before the parallel suites run.
+ */
+data class TestUser(
+    val username: String,
+    val email: String,
+    val password: String,
+    val firstName: String = "Test",
+    val lastName: String = "User",
+) {
+    companion object {
+        /** Pre-existing user seeded against the dev backend. */
+        fun seededTestUser(): TestUser = TestUser(
+            username = "testuser",
+            email = "testuser@honeydue.com",
+            password = "TestPass123!",
+        )
+
+        /** Admin account used by admin-gated flows. */
+        fun seededAdminUser(): TestUser = TestUser(
+            username = "admin",
+            email = "admin@honeydue.com",
+            password = "Test1234",
+        )
+
+        /**
+         * Unique, ephemeral user used for registration flows that cannot
+         * re-use an existing account. Cleaned up by `SuiteZZ_CleanupTests`.
+         */
+        fun ephemeralUser(suffix: String = randomSuffix()): TestUser = TestUser(
+            username = "uitest_$suffix",
+            email = "uitest_$suffix@test.com",
+            password = "TestPassword123!",
+            firstName = "Test",
+            lastName = "User",
+        )
+
+        private fun randomSuffix(): String =
+            Random.nextInt(100_000, 999_999).toString()
+    }
+}