refactor(editor): extract --info-tilemap into cli_tilemap.cpp

Moves the project-wide ADT-grid visualization handler
(--info-tilemap) out of main.cpp into a new
cli_tilemap.{hpp,cpp} module. Renders the WoW 64x64 tile
grid showing which tiles are claimed by which zones, with
collision detection (multiple zones claiming the same tile)
and per-zone glyph legend. Empty rows are skipped so the
output stays bounded for projects in one map corner.

main.cpp shrinks by 114 lines (3,433 to 3,319). --json
output mode preserved for CI pipelines.

tools/editor/cli_tilemap.hpp

@@ -0,0 +1,19 @@
+#pragma once
+
+namespace wowee {
+namespace editor {
+namespace cli {
+
+// Dispatch the --info-tilemap project-wide tile-grid handler.
+// Renders the WoW 64x64 ADT grid showing which tiles are
+// claimed by which zones, with collision detection (multiple
+// zones claiming the same tile). Useful for spotting tile-
+// coord overlaps before two zones try to ship conflicting
+// content. Supports --json for machine-readable reports.
+//
+// Returns true if matched; outRc holds the exit code.
+bool handleTilemap(int& i, int argc, char** argv, int& outRc);
+
+} // namespace cli
+} // namespace editor
+} // namespace wowee