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Heap Profiling with Heaptrack
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Records every malloc/free/realloc with full call stacks using KDE's heaptrack.

Usage
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.. code-block:: bash

   # CLI (opens browser)
   memguard heapprofile /tmp/binary
   memguard heapprofile /tmp/server --args "--port 8080"
   memguard heapprofile /tmp/server --timeout 30

   # Via GUI: click purple "Heap Profile" button

   # Prerequisites
   sudo apt install heaptrack

Visualization Tabs
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- **Heap Timeline** - SVG chart of memory over time with peak marker
- **Top Allocators** - Table sorted by peak bytes with proportional bars
- **Flame Graph** - Stacked bars showing call depth proportional to bytes