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Bolt: Optimize status bar rendering

💡 What: Replaced malloc/free with a stack buffer char buf[1024] in bar.c:drawstatusbar.
🎯 Why: To eliminate heap allocation/deallocation overhead in the critical UI rendering loop. The status text buffer stext is globally defined as 1024 bytes, so a matching stack buffer is safe and much faster.
📊 Impact: Reduces latency in status bar updates and avoids heap fragmentation.
🔬 Measurement: Verified code compiles and logic preserves existing functionality (using strncpy and null-termination). Confirmed stext size in globals.h.


PR created automatically by Jules for task 4002755907638858591 started by @paperbenni

Replaced dynamic allocation in `drawstatusbar` with a fixed-size stack buffer (`char buf[1024]`).
This removes memory allocation overhead from the frequent UI rendering path.
The global status text buffer `stext` is fixed at 1024 bytes, ensuring safety.

Co-authored-by: paperbenni <15818888+paperbenni@users.noreply.github.com>
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