Broken navigation with nested anonymous structures

Version and Platform (required):

• Binary Ninja Version: 6.1.10668-dev
• Edition: Ultimate
• OS: macOS
• OS Version: 27.0
• CPU Architecture: M5

Bug Description:
Trying to navigate to a field nested in one or more anonymous structures fails to navigate.

Steps To Reproduce:

Structure:
struct foo {
    int pad;
    struct {
        int bar;
    } inner;
};

Code (x86 Windows):
int32_t sub_0(struct foo* arg1)
mov     eax, dword [esp+0x4]
mov     eax, dword [eax+0x4]
retn

HLIL:
return arg1->inner.bar

Trying to double click bar fails to navigate to the field. Looking at the token itself:

>>> current_il_instruction.tokens[-1].typeNames
['bar']

The token doesn't have valid type information for figuring out how to navigate to it.

Making it a union instead:

union foo_u
{
    struct
    {
        int32_t a;
        int32_t b;
    } bar;
};

Function type:
int32_t sub_0(union foo_u* arg1)

HLIL (broken):
return arg1->bar.__offset(0x4).d

MLIL:
eax = eax_1->bar.b

Double clicking b in MLIL also fails to navigate. The token for this:

>>> current_il_instruction.tokens[-1].typeNames
['foo_u', 'bar', 'b']

These two types also fail to navigate when made into data variables.

Expected Behavior:
Double clicking the inner field of these structures should navigate to that field in the types view.

Start by reproducing the nested anonymous-structure and union examples in the types view, then inspect the HLIL/MLIL tokens and their typeNames as described. Trace how double-click navigation resolves those tokens, including data variables, and consider the issue done when inner fields navigate to their definitions.