Bad context for error messages

[cscheid]

In at least one setting, our context-detection mechanism for producing good error messages is failing. This is, specifically, a missing quote here:

https://github.com/djnavarro/blog/blob/main/posts/2022-03-04_data-types-in-arrow-and-r/index.qmd#L1168

Our parser, somehow, is convinced that the relevant opening quote happens 500 lines before it, and we end up with a pretty misleading error message.

Another one:

    Finished `dev` profile [optimized + debuginfo] target(s) in 0.05s
     Running `/Users/cscheid/repos/github/cscheid/kyoto/target/debug/quarto-markdown-pandoc -i ../../external-sites/stat479_fall2025/website/guides/plot_vertical_statsbomb.qmd`
Error: [Q-2-8] Unsupported Code Block Syntax
    ╭─[../../external-sites/stat479_fall2025/website/guides/plot_vertical_statsbomb.qmd:30:6]
    │
 21 │ ![StatsBomb Coordinate System](figures/statsbomb_coordinates.png){width=50% fig-align="center"}
    │                                                                             ────┬────
    │                                                                                 ╰────── use a YAML block syntax in a comment with `|`.
    │
 30 │ ```{r initial-plot}
    │      ┬
    │      ╰── Quarto Markdown requires executable code block options in YAML.
────╯