Fix review issues: error handling, stdin TTY hint, narrow exceptions - Handle UnicodeDecodeError and PermissionError for file reading - Show hint when stdin is a TTY and no file given - Narrow JSON fallback exception from Exception to (SyntaxError, ValueError) - Rename 'type' parameter to 'file_type' to avoid shadowing builtin - Remove dead '.R' entry from EXTENSION_MAP

src/rp/render.py

@@ -39,7 +39,7 @@ def render(
     elif file_type in _JSON_TYPES:
         try:
             renderable = RichJSON(content)
-        except Exception:
+        except (SyntaxError, ValueError):
             renderable = Syntax(
                 content, "json", theme=options.theme, line_numbers=line_numbers
             )