feat(context): Implement ContextPreset and FileViewPreset infrastructure

tests/test_context_presets_models.py

@@ -0,0 +1,45 @@
+import pytest
+from src.models import ContextPreset, FileViewPreset
+
+def test_file_view_preset_serialization():
+    p = FileViewPreset(path="test.py", view_mode="skeleton")
+    d = p.to_dict()
+    assert d == {"path": "test.py", "view_mode": "skeleton"}
+    
+    p2 = FileViewPreset.from_dict(d)
+    assert p2.path == "test.py"
+    assert p2.view_mode == "skeleton"
+
+def test_context_preset_serialization():
+    f1 = FileViewPreset(path="a.py", view_mode="full")
+    f2 = FileViewPreset(path="b.py", view_mode="summary")
+    
+    preset = ContextPreset(
+        name="test_preset",
+        files=[f1, f2],
+        screenshots=["shot1.png"]
+    )
+    
+    d = preset.to_dict()
+    assert len(d["files"]) == 2
+    assert d["files"][0]["path"] == "a.py"
+    assert d["screenshots"] == ["shot1.png"]
+    
+    p2 = ContextPreset.from_dict("test_preset", d)
+    assert p2.name == "test_preset"
+    assert len(p2.files) == 2
+    assert p2.files[0].view_mode == "full"
+    assert p2.screenshots == ["shot1.png"]
+
+def test_context_preset_from_dict_legacy():
+    # Test handling of legacy string paths in preset files
+    d = {
+        "files": ["legacy.py", {"path": "new.py", "view_mode": "skeleton"}],
+        "screenshots": []
+    }
+    preset = ContextPreset.from_dict("legacy_test", d)
+    assert len(preset.files) == 2
+    assert preset.files[0].path == "legacy.py"
+    assert preset.files[0].view_mode == "summary" # Default
+    assert preset.files[1].path == "new.py"
+    assert preset.files[1].view_mode == "skeleton"