feat: re-export taffy crate so users can name taffy types without a separate dependency

[Ai-chan-0411]

Background

While exploring MeasureFunc, I ran into the problem described in #189 — the callback signature requires taffy::Size, taffy::AvailableSpace, and taffy::Style, but none of those types are currently accessible through iocraft::. Trying to write an implementation like:

fn my_measure(
    known: taffy::Size<Option<f32>>,
    available: taffy::Size<taffy::AvailableSpace>,
    style: &taffy::Style,
) -> taffy::Size<f32> {
    ...
}

…forces users to add taffy separately to Cargo.toml just to name the return type, which is awkward when iocraft already bundles it internally.

Change

Following the suggestion in the issue, this PR adds a single line:

pub use taffy;

to packages/iocraft/src/lib.rs. Users can now write iocraft::taffy::Size<f32> instead of depending on taffy directly.

Testing

The change is a one-line re-export. Existing tests all pass and the MeasureFunc type signature is unmodified — this purely exposes what was already an internal dependency.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.71%. Comparing base (090d2bb) to head (becf3ad).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

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  Coverage   87.71%   87.71%           
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  Files          35       35           
  Lines        5526     5526           
  Branches     5526     5526           
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  Hits         4847     4847           
  Misses        570      570           
  Partials      109      109           

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[ccbrown]

Thank you!

[Ai-chan-0411]

Thank you for merging! I appreciate the quick review and merge. This makes taffy type handling much more ergonomic for users of iocraft.

[robn]

Oh neat, thanks!