fix(examples): reset cursor on ctrl+c in counter example

[mvanhorn]

What It Does

Adds the maintainer's option-1 fix from #197 to examples/counter.rs: a single hooks.use_terminal_events(|_| {}) call (with a comment explaining why) that puts the terminal in raw mode so ctrl+c is delivered as a key event instead of a SIGINT. With raw mode active, the existing ignore_ctrl_c path in packages/iocraft/src/element.rs:514 exits the render loop cleanly and runs drop handlers, which restores the cursor. Every other interactive example already does this (use_input.rs:15, weather.rs:222, fullscreen.rs:19, scrolling.rs:14, form.rs:58, calculator.rs:261); the counter example was the outlier.

This is intentionally the smallest possible change. The library itself is untouched and no new dependencies are added, matching the maintainer's note that iocraft should not set a global signal handler. If you'd rather close this in favor of a documentation-only approach (the second half of your suggestion), this PR can be discarded without churn.

Related Issues

Closes #197

This contribution was developed with AI assistance (Codex).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.00%. Comparing base (b92b621) to head (7d7eacd).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #198   +/-   ##
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  Coverage   88.00%   88.00%           
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  Files          35       35           
  Lines        5662     5662           
  Branches     5662     5662           
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  Hits         4983     4983           
  Misses        569      569           
  Partials      110      110           

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[ccbrown]

Thank you!

[mvanhorn]

Thanks @ccbrown for the merge and for laying out option 1 so clearly in #197 - dropping that one-liner into counter.rs ended up being the cleanest fix for the cursor restore.