Build the Ganjoor reader on the static ganjoor-data set

Poets grid, category browsing and a poem reader backed by
github.com/anas-rashid/ganjoor-data over jsDelivr — no backend, addressed by
Ganjoor URLs rather than numeric ids, with a 64 MB OkHttp disk cache so
anything already read stays readable offline.

Reading: couplets stack with the first hemistich at the start of the line and
the second at the end; prose sections fill the column. Bundled Noto Naskh
Arabic and Noto Nastaliq Urdu, switchable while reading, with the extra
leading nastaliq needs. Five themes (system, light, dark, sepia, sepia night)
and a text size slider, all persisted. Whole app lays out right-to-left.

Verified on an API 36 emulator through poets -> category -> poem in both
sepia schemes and both fonts.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

app/src/test/java/com/ganjoor/android/CoupletsTest.kt

@@ -0,0 +1,68 @@
+package com.ganjoor.android
+
+import com.ganjoor.android.data.Verse
+import com.ganjoor.android.data.couplets
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+class CoupletsTest {
+    private fun verse(order: Int, position: String) =
+        Verse(vOrder = order, position = position, text = "v$order")
+
+    @Test
+    fun `right and left hemistichs pair into one couplet`() {
+        val grouped = listOf(
+            verse(1, Verse.RIGHT),
+            verse(2, Verse.LEFT),
+            verse(3, Verse.RIGHT),
+            verse(4, Verse.LEFT),
+        ).couplets()
+
+        assertEquals(2, grouped.size)
+        assertEquals(listOf("v1", "v2"), grouped[0].map { it.text })
+        assertEquals(listOf("v3", "v4"), grouped[1].map { it.text })
+    }
+
+    @Test
+    fun `out of order verses are sorted before grouping`() {
+        val grouped = listOf(verse(2, Verse.LEFT), verse(1, Verse.RIGHT)).couplets()
+
+        assertEquals(1, grouped.size)
+        assertEquals(listOf("v1", "v2"), grouped[0].map { it.text })
+    }
+
+    @Test
+    fun `prose and single verses each stand alone`() {
+        val grouped = listOf(
+            verse(1, "Paragraph"),
+            verse(2, "Single"),
+            verse(3, Verse.RIGHT),
+            verse(4, Verse.LEFT),
+        ).couplets()
+
+        assertEquals(listOf(1, 1, 2), grouped.map { it.size })
+    }
+
+    @Test
+    fun `a left hemistich without its right half is not swallowed by the previous couplet`() {
+        val grouped = listOf(
+            verse(1, Verse.RIGHT),
+            verse(2, Verse.LEFT),
+            verse(3, Verse.LEFT),
+        ).couplets()
+
+        assertEquals(listOf(2, 1), grouped.map { it.size })
+    }
+
+    @Test
+    fun `centered verses pair with each other, not with hemistichs`() {
+        val grouped = listOf(
+            verse(1, Verse.CENTERED_1),
+            verse(2, Verse.CENTERED_2),
+            verse(3, Verse.RIGHT),
+            verse(4, Verse.CENTERED_2),
+        ).couplets()
+
+        assertEquals(listOf(2, 1, 1), grouped.map { it.size })
+    }
+}

app/src/test/java/com/ganjoor/android/ExampleUnitTest.kt

@@ -1,17 +0,0 @@
-package com.ganjoor.android
-
-import org.junit.Test
-
-import org.junit.Assert.*
-
-/**
- * Example local unit test, which will execute on the development machine (host).
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-class ExampleUnitTest {
-    @Test
-    fun addition_isCorrect() {
-        assertEquals(4, 2 + 2)
-    }
-}