font issue/gap between unicode lines characters `──`

printing
```
╭────────────────╮
│ ABC😀 │
│Hello World 乒乓│
│ Shorter text. │
│ also short │
╰────────────────╯
```
works fine/correctly on ghostty mac tip with default config (no special font set):

but with ghostty-web there is a gap between the characters:

it could just be I am holding it wrong: the code is (which is likely terrible):
https://github.com/grol-io/grol/blob/wasm_term/wasm/ghostty.html