test(editor): add 4 quest validateChains tests + rename to test_editor_units

Tests cover:
- non-existent nextQuestId is flagged
- orphan quests (no questgiver, no turn-in) are flagged
- turn-in only quest is accepted (auto-completed quest pattern)
- circular chain is detected

Renamed test_sql_escape → test_editor_units since the file now
houses both SQL escape and quest validation tests.

tests/CMakeLists.txt

@@ -414,25 +414,25 @@ target_link_libraries(test_open_formats PRIVATE catch2_main)
 add_test(NAME open_formats COMMAND test_open_formats)
 register_test_target(test_open_formats)
 
-# ── test_sql_escape ──────────────────────────────────────────
-add_executable(test_sql_escape
-    test_sql_escape.cpp
+# ── test_editor_units (SQL escape, quest validation, …) ─────
+add_executable(test_editor_units
+    test_editor_units.cpp
     ${CMAKE_SOURCE_DIR}/tools/editor/sql_exporter.cpp
     ${CMAKE_SOURCE_DIR}/tools/editor/npc_spawner.cpp
     ${CMAKE_SOURCE_DIR}/tools/editor/quest_editor.cpp
     ${CMAKE_SOURCE_DIR}/src/core/logger.cpp
 )
-target_include_directories(test_sql_escape PRIVATE
+target_include_directories(test_editor_units PRIVATE
     ${TEST_INCLUDE_DIRS}
     ${CMAKE_SOURCE_DIR}/tools/editor
 )
-target_include_directories(test_sql_escape SYSTEM PRIVATE
+target_include_directories(test_editor_units SYSTEM PRIVATE
     ${TEST_SYSTEM_INCLUDE_DIRS}
     ${CMAKE_SOURCE_DIR}/extern/nlohmann
 )
-target_link_libraries(test_sql_escape PRIVATE catch2_main)
-add_test(NAME sql_escape COMMAND test_sql_escape)
-register_test_target(test_sql_escape)
+target_link_libraries(test_editor_units PRIVATE catch2_main)
+add_test(NAME editor_units COMMAND test_editor_units)
+register_test_target(test_editor_units)
 
 # ── ASAN / UBSan for test targets ────────────────────────────
 if(WOWEE_ENABLE_ASAN AND NOT MSVC)