Raw block inside div is treated as a codeblock.

Nobody has claimed this yet.

Raw blocks in djot use triple backticks like code blocks but require the language to start with an `=` symbol to differentiate them. Raw blocks are passed directly to the renderer

````djot
::: actions
``` =toml
[[actions]]
this = "is a test"
```
:::
````

The above djot document parses in the official [djot playground](https://djot.net/playground/?text=%3A%3A%3A+actions%0A%60%60%60+%3Dtoml%0A%5B%5Bactions%5D%5D%0Athis+%3D+%22is+a+test%22%0A%60%60%60%0A%3A%3A%3A&mode=ast&sourcepos=false) as:

```
doc
div class="actions"
raw_block format="toml" text="[[actions]]\nthis = \"is a test\"\n"
```

But jot incorrectly parses this as a code block. Logging the div's `items:` field shows:

```gleam
[Codeblock(dict.from_list([]), Some("=toml"), "[[actions]]\nthis = "is a test"\n")]
```

Start with the minimal Djot example in the issue and trace the parser entry point that handles fenced blocks inside div contents. Done when the example produces a raw_block with format="toml" rather than a codeblock, while ordinary fenced code blocks still parse as codeblocks.

Written by the indexing model from the issue text.