fix(python): correct PermissionHandler.approve_all type annotations (github#618)

The approve_all static method used untyped parameters (Any) and returned
a plain dict, conflicting with the _PermissionHandlerFn signature that
expects (PermissionRequest, dict[str, str]) -> PermissionRequestResult.

- Replace parameter types: Any → PermissionRequest, dict[str, str]
- Replace return type: dict → PermissionRequestResult
- Use PermissionRequestResult() constructor instead of dict literal

Fixes github#612

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: giulio-leone

python/copilot/types.py

@@ -192,8 +192,10 @@ class PermissionRequestResult(TypedDict, total=False):
 
 class PermissionHandler:
     @staticmethod
-    def approve_all(request: Any, invocation: Any) -> dict:
-        return {"kind": "approved"}
+    def approve_all(
+        request: PermissionRequest, invocation: dict[str, str]
+    ) -> PermissionRequestResult:
+        return PermissionRequestResult(kind="approved")
 
 
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