Add image selection refinement functionality with BEN2 integration

- Implemented viewport.py for handling 3D view projections, gestures, and overlay drawing.
- Created refine_image_selection.py to manage the refinement of gesture masks and output image bounds.
- Added selection module with refine_selection.py to process and crop images based on alpha channel visibility.
- Introduced __init__.py for selection module to expose refine_selection function.

tests/test_image_data.py

@@ -1,3 +1,5 @@
+import ast
+import importlib
 import importlib.util
 import sys
 import tempfile
@@ -7,6 +9,47 @@ from types import ModuleType, SimpleNamespace
 from unittest.mock import patch
 
 PROJECT_ROOT = Path(__file__).resolve().parents[1]
+SOURCE_ROOT = PROJECT_ROOT / "src"
+sys.path.insert(0, str(SOURCE_ROOT))
+COMMON_ROOT = SOURCE_ROOT / "anyimage" / "common"
+COMMON_MODULES = {
+    "ai",
+    "depth",
+    "image",
+    "material",
+    "node",
+    "object",
+    "selection",
+    "viewport",
+}
+
+
+def test_common_modules_follow_business_boundaries():
+    module_names = {
+        path.stem
+        for path in COMMON_ROOT.glob("*.py")
+        if path.name != "__init__.py"
+    }
+    assert module_names == COMMON_MODULES
+
+    for module_name in COMMON_MODULES:
+        importlib.import_module(f"anyimage.common.{module_name}")
+
+    ai_ui_definitions = {
+        path.name
+        for path in COMMON_ROOT.glob("*.py")
+        if "def draw_ai_setup(" in path.read_text(encoding="utf-8")
+        or "def draw_ai_property(" in path.read_text(encoding="utf-8")
+    }
+    assert ai_ui_definitions == {"ai.py"}
+
+    init_tree = ast.parse(
+        (COMMON_ROOT / "__init__.py").read_text(encoding="utf-8")
+    )
+    assert not any(
+        isinstance(node, (ast.Import, ast.ImportFrom))
+        for node in init_tree.body
+    )
 
 
 def load_image_modules():
@@ -24,12 +67,12 @@ def load_image_modules():
 
     module_paths = (
         (
-            "anyimage.common.image_data",
+            "anyimage.common.image",
             PROJECT_ROOT
             / "src"
             / "anyimage"
             / "common"
-            / "image_data.py",
+            / "image.py",
         ),
         (
             "anyimage.common.node",
@@ -39,6 +82,14 @@ def load_image_modules():
             / "common"
             / "node.py",
         ),
+        (
+            "anyimage.common.material",
+            PROJECT_ROOT
+            / "src"
+            / "anyimage"
+            / "common"
+            / "material.py",
+        ),
         (
             "anyimage.common.object",
             PROJECT_ROOT