feat(presets): Implement NamedViewPresets for per-file view settings

src/models.py

@@ -939,6 +939,30 @@ class FileViewPreset:
    view_mode=data.get("view_mode", "summary")
   )
 
+@dataclass
+class NamedViewPreset:
+ name: str
+ view_mode: str
+ ast_mask: dict = field(default_factory=dict)
+ custom_slices: list = field(default_factory=list)
+
+ def to_dict(self) -> dict[str, Any]:
+  return {
+   "name": self.name,
+   "view_mode": self.view_mode,
+   "ast_mask": self.ast_mask,
+   "custom_slices": self.custom_slices
+  }
+
+ @classmethod
+ def from_dict(cls, data: dict[str, Any]) -> "NamedViewPreset":
+  return cls(
+   name=data.get("name", ""),
+   view_mode=data.get("view_mode", "summary"),
+   ast_mask=data.get("ast_mask", {}),
+   custom_slices=data.get("custom_slices", [])
+  )
+
 @dataclass
 class ContextPreset:
  name: str