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Memory Visualization
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Interactive HTML visualization with four tabs.

Usage
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.. code-block:: bash

   memguard viz <scan-id>    # opens in browser

Also appears inline in the web dashboard after scanning.

Tabs
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- **Memory Profile** - SVG line chart of cumulative heap usage with peak marker and leaked indicator
- **Allocation Table** - Sortable table with Function, Via, Location, Size bar, Status badge. Click rows for detail drawer.
- **Heap Treemap** - Proportional colored boxes (red = leaked, green = freed)
- **Ownership Flow** - Curved SVG arrows between function nodes showing pointer ownership transfer