Fix parser error pointing to wrong line when last line has no trailing newline (#1041)

When parsing a key without '=' at EOF (e.g., "a = 1\nb = 2\nc"), the
error highlight was an empty slice, causing subsliceOffset to return 0
and the error to point at line 1 instead of line 3. Pass the consumed
key bytes as the highlight instead of the empty remainder.

Fixes #1032

https://claude.ai/code/session_01UWv8pyc8P1ktAPfHpveixj

Co-authored-by: Claude <noreply@anthropic.com>

errors_test.go

@@ -259,6 +259,12 @@ func TestDecodeError_Position(t *testing.T) {
 			expectedRow: 3,
 			minCol:      5,
 		},
+		{
+			name:        "missing equals on last line without trailing newline",
+			doc:         "a = 1\nb = 2\nc",
+			expectedRow: 3,
+			minCol:      1,
+		},
 	}
 
 	for _, e := range examples {