Add translation-aware passage queries

tests/test_passage_query.nim

@@ -0,0 +1,44 @@
+import std/unittest
+
+import ../src/passage_query
+
+suite "passage query parser":
+  test "uses the default translation when no marker is present":
+    let queries = parsePassageQueries("John 3:16", "kjv")
+
+    check queries.len == 1
+    check queries[0].referenceText == "John 3:16"
+    check queries[0].translation == "kjv"
+
+  test "uses a trailing translation marker":
+    let queries = parsePassageQueries("2 John 5 (KJV)", "esv")
+
+    check queries.len == 1
+    check queries[0].referenceText == "2 John 5"
+    check queries[0].translation == "kjv"
+
+  test "parses mixed translation queries":
+    let queries = parsePassageQueries("2 John 5 (KJV); 2 John 5 (ESV)", "mev")
+
+    check queries.len == 2
+    check queries[0].referenceText == "2 John 5"
+    check queries[0].translation == "kjv"
+    check queries[1].referenceText == "2 John 5"
+    check queries[1].translation == "esv"
+
+  test "uses the default translation per unmarked reference":
+    let queries = parsePassageQueries("John 3:16; Psalm 23 (MEV)", "nkjv")
+
+    check queries.len == 2
+    check queries[0].referenceText == "John 3:16"
+    check queries[0].translation == "nkjv"
+    check queries[1].referenceText == "Psalms 23"
+    check queries[1].translation == "mev"
+
+  test "rejects unknown translation markers":
+    expect ValueError:
+      discard parsePassageQueries("John 3:16 (XYZ)", "esv")
+
+  test "rejects unknown default translations":
+    expect ValueError:
+      discard parsePassageQueries("John 3:16", "xyz")