fix: don't store frame-arena string in mouse example#126
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Fixes #122
The Count++ handler stored a string allocated from ctx.allocator in the model. That allocator is a per-frame arena that gets reset every tick, so last_event ended up pointing at freed memory. Whatever got rendered from it could wrap or contain newlines, which left a stale row on screen and showed up as the duplicated help line. Use a static message instead, the count is already shown on its own line.