Set each couplet in a dim rounded card, on every screen size

Each line of verse now sits in its own soft card (surface-container-high,
12dp corners), so the eye finds where one couplet ends and the next
begins, and the couplet's chevron, actions and summary visibly belong to
it. On OLED black that step is all but black, so the card takes the next
one up there. Prose stays bare: a paragraph in a box reads as a quotation.

Text keeps at least 6:1 on the card in every theme. The phone layout is
otherwise unchanged.

Updates the Couplet notes, the stylesheet and wireframes 4-8, and adds
wireframe 9 for the phone.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RhmDdrN5hgWrgRcFLAMsV6

app/src/main/java/com/ganjoor/android/ui/PoemScreen.kt

@@ -7,6 +7,10 @@ import androidx.compose.animation.fadeIn
 import androidx.compose.animation.fadeOut
 import androidx.compose.animation.shrinkHorizontally
 import androidx.compose.foundation.clickable
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.Color
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.background
 import androidx.compose.foundation.gestures.detectTapGestures
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
@@ -251,6 +255,9 @@ fun PoemScreen(
     }
 }
 
+/** The positions that make a line of verse; anything else (Single, Paragraph, Comment) is prose. */
+private val VERSE_POSITIONS = setOf(Verse.RIGHT, Verse.LEFT, Verse.CENTERED_1, Verse.CENTERED_2)
+
 /** A word someone tapped: what to look up, the couplet it came from, and where it sits in its verse. */
 private data class WordTap(val word: String, val passage: Bookmark, val verse: Int, val range: IntRange)
 
@@ -379,7 +386,26 @@ private fun Couplet(
     val oneLine = sideBySide && couplet.size == 2 &&
         couplet[0].position == Verse.RIGHT && couplet[1].position == Verse.LEFT
 
-    Column(modifier = Modifier.fillMaxWidth().padding(vertical = 6.dp)) {
+    // Each line of verse sits in its own soft card, so the eye finds where one couplet ends and
+    // the next begins, and the couplet's actions visibly belong to it. Prose (Golestan,
+    // Nowruznameh) stays bare: a paragraph in a box reads as a quotation, not as the text.
+    val isVerse = couplet.all { it.position in VERSE_POSITIONS }
+    val colors = MaterialTheme.colorScheme
+    // A step lighter than the page. On OLED black the usual step is all but black itself, so
+    // the card takes the next one up: still dim, but there.
+    val cardColor =
+        if (colors.surface == Color.Black) colors.surfaceContainerHighest else colors.surfaceContainerHigh
+    val card = if (isVerse) {
+        Modifier
+            .padding(vertical = 4.dp)
+            .clip(RoundedCornerShape(12.dp))
+            .background(cardColor)
+            .padding(horizontal = 12.dp, vertical = 8.dp)
+    } else {
+        Modifier.padding(vertical = 6.dp)
+    }
+
+    Column(modifier = Modifier.fillMaxWidth().then(card)) {
         if (oneLine) {
             Row(modifier = Modifier.fillMaxWidth()) {
                 couplet.forEachIndexed { index, verse ->