Fix setup UX: remove Hz wording and make setup scrollable

app/src/test/java/com/mindmachine/mvp/SessionValidatorTest.kt

@@ -40,7 +40,7 @@ class SessionValidatorTest {
     fun out_of_range_values_are_blocked() {
         assertEquals("Duration must be 1 to 30 minutes.", SessionValidator.validate(valid.copy(durationSec = 59), true))
         assertEquals("Flash interval must be 0.05 to 2.00 seconds.", SessionValidator.validate(valid.copy(flashIntervalMs = 49), true))
-        assertEquals("Carrier frequency must be 80 to 400 Hz.", SessionValidator.validate(valid.copy(carrierFrequencyHz = 79f), true))
-        assertEquals("Binaural difference must be 0.5 to 20 Hz.", SessionValidator.validate(valid.copy(binauralDifferenceHz = 0.1f), true))
+        assertEquals("Carrier frequency must be between 80 and 400.", SessionValidator.validate(valid.copy(carrierFrequencyHz = 79f), true))
+        assertEquals("Binaural difference must be between 0.5 and 20.", SessionValidator.validate(valid.copy(binauralDifferenceHz = 0.1f), true))
     }
 }

app/src/test/java/com/mindmachine/mvp/SetupScreenUiLogicTest.kt

@@ -0,0 +1,18 @@
+package com.mindmachine.mvp
+
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertTrue
+import org.junit.Test
+
+class SetupScreenUiLogicTest {
+    @Test
+    fun flash_interval_label_uses_seconds_text_source() {
+        assertEquals("Flash interval: 0.17 s", setupScreenFlashIntervalLabel(167))
+        assertEquals("Flash interval: 2.00 s", setupScreenFlashIntervalLabel(2000))
+    }
+
+    @Test
+    fun setup_screen_layout_uses_scrollable_container() {
+        assertTrue(setupScreenUsesScrollableContainer())
+    }
+}