refactor(editor): extract --info-{zone,project}-tree into cli_info_tree.cpp

Moves the two tree-style content browser handlers
(--info-zone-tree, --info-project-tree) out of main.cpp into
a new cli_info_tree.{hpp,cpp} module. Both render
Unix-`tree`-style hierarchical views — one drilling into a
single zone (manifest, tiles, creatures, objects, quests,
files) and one giving a bird's-eye view of every zone in a
project with bake/viewer status.

main.cpp shrinks by 201 lines (8,140 to 7,939). The remaining
info-zone/-project-* pairs (bytes, extents, water, density,
audio) form the next natural extraction batch.

tools/editor/cli_info_tree.hpp

@@ -0,0 +1,20 @@
+#pragma once
+
+namespace wowee {
+namespace editor {
+namespace cli {
+
+// Dispatch the tree-style content browser handlers — Unix
+// `tree`-style hierarchical views of zone and project contents
+// (manifest, tiles, creatures, objects, quests, files, baked
+// artifacts). Designed for at-a-glance comprehension of what
+// lives in a given directory without opening the JSON files.
+//   --info-zone-tree     drill into one zone's contents
+//   --info-project-tree  bird's-eye view of every zone in a project
+//
+// Returns true if matched; outRc holds the exit code.
+bool handleInfoTree(int& i, int argc, char** argv, int& outRc);
+
+} // namespace cli
+} // namespace editor
+} // namespace wowee