qlog-dancer: wasm build fails to compile (f32/f64 type mismatches in web.rs)

`wasm-pack build --target=web` in `qlog-dancer/` fails:

```
error[E0308]: mismatched types
--> qlog-dancer/src/web.rs:740:26
|
740 | end: x_end,
| ^^^^^ expected `Option`, found `Option`
|
= note: expected enum `std::option::Option`
found enum `std::option::Option`

error[E0308]: mismatched types
--> qlog-dancer/src/web.rs:763:58
|
763 | Some(ChartInfo::::with_u64_f32(&chart));
| ----------------------------------- ^^^^^^ expected `RangedCoordf32`, found `RangedCoordf64`
| |
| arguments to this function are incorrect
|
= note: expected reference `&plotters::chart::ChartContext<'_, _, plotters::prelude::Cartesian2d<_, RangedCoordf32>>`
found reference `&plotters::chart::ChartContext<'_, _, plotters::prelude::Cartesian2d<_, RangedCoordf64>>`
```

Bug was introduced by https://github.com/cloudflare/quiche/pull/2386

This was not caught by CI because qlog-dancer is excluded.

Run `wasm-pack build --target=web` in `qlog-dancer/` and inspect the reported mismatches in `qlog-dancer/src/web.rs` around lines 740 and 763. Trace the chart types used there and verify that the build completes successfully after the type mismatch is resolved.

Written by the indexing model from the issue text.