feat(verses): enable support for multi-ayah tafsir

via verse ID range join

- Introduced support for multi-ayah tafsir loading in VerseFinder
- Added load_tafsirs method to join tafsirs based on verse ID range (start_verse_id to end_verse_id)
- Ensured single-ayah tafsir continues to work as expected
- Maintains backward compatibility while enabling richer tafsir rendering across APIs like /v4/verses/by_key

Author: basit3407

app/finders/verse_finder.rb

@@ -28,6 +28,8 @@ def load_verses(language_code)
     load_translations
     load_words(language_code)
     load_audio
+    load_tafsirs   # ← add this line
+
     translations_order = params[:translations].present? ? ',translations.priority ASC' : ''
 
     @results.order("verses.verse_index ASC, words.position ASC, word_translations.priority ASC #{translations_order}".strip)
@@ -84,6 +86,23 @@ def load_audio
     end
   end
 
+  # Load tafsirs that span the current verse (single-ayah OR multi-ayah)
+  def load_tafsirs
+    return unless params[:tafsirs].present?
+
+    tafsir_ids = Array(params[:tafsirs]).map(&:to_i)
+
+    @results = @results
+                .joins(<<~SQL)
+                  LEFT JOIN tafsirs
+                    ON tafsirs.start_verse_id <= verses.id
+                    AND (tafsirs.end_verse_id IS NULL OR tafsirs.end_verse_id >= verses.id)
+                SQL
+                .where(tafsirs: { resource_content_id: tafsir_ids })
+                .eager_load(:tafsirs)
+  end
+
+
   def set_offset
     if offset.present?
       @results = @results.offset(offset)