[Rework] WebUI: Replace Glyphicons with FontAwesome SVG icons

[Rework] WebUI: Replace Glyphicons with FontAwesome SVG icons

The implementation uses a global MutationObserver watching document.body that:

-  Detects when new fooicon elements are added to the DOM
-  Detects when class attributes change on existing fooicon elements (e.g., sort icon cycling)
-  Automatically processes and replaces icons

Benefits:

✓ Sharp SVG rendering at all zoom levels (vs blurry webfonts)
✓ No font loading issues or CORS problems
✓ Reduced code footprint

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: moisseev <2275981+moisseev@users.noreply.github.com>