refactor(systray): rely on fabric stock icon handling

Upstream fabric now resolves tray icons correctly, so the local
pixbuf fallback patch is gone. The patch keeps only config-based
item hiding by wrapping do_update_properties.

pyproject.toml

@@ -106,4 +106,4 @@ known-first-party = ["services", "utils", "shared", "window"]
 "examples/**" = ["INP001", "D101", "D102", "D103"]
 
 [tool.uv.sources]
-fabric = { git = "https://github.com/Fabric-Development/fabric.git", tag = "v0.0.2" }
+fabric = { git = "https://github.com/Fabric-Development/fabric.git" }