### What?
Brackets (`[ ]`) in option values end up in GraphQL enum names via
`formatName`, causing schema generation to fail. This PR adds a single
rule to `formatName`:
- replace `[` and `]` with `_`
### Why?
Using `_` (instead of removing the brackets) is safer and more
consistent:
- Avoid collisions: removal can merge distinct strings (`"A[B]"` →
`"AB"`). `_` keeps them distinct (`"A_B"`).
- **Consistency**: `formatName` already maps punctuation to `_` (`. - /
+ , ( ) '`). Brackets follow the same rule.
Readability: `mb-[150px]` → `mb__150px_` is clearer than `mb150px`.
Digits/units safety: removal can jam characters (`w-[2/3]` → `w23`); `_`
avoids that (`w_2_3_`).
### How?
Update formatName to include a bracket replacement step:
```
.replace(/\[|\]/g, '_')
```
No other call sites or value semantics change; only names containing
brackets are affected.
Fixes#13466
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