Revert "Hotfix: disable pywebview dashboard until memory leak is resolved"

This reverts commit 98c7572801.

The issue that was supposed to be fixed was already resolved by 87accc6.

src/serena/dashboard.py

@@ -715,7 +715,7 @@ class SerenaDashboardViewer:
         # The dashboard viewer (with system tray) is technically supported only on Windows and macOS.
         # Linux support is problematic; see https://github.com/oraios/serena/pull/1117#issuecomment-4128753943
         supported_platforms = [
-            # "win32",
+            "win32",
             # NOTE: Disabling macOS support for now, because the tray behaviour is suboptimal (too many icons when
             #   subagents are spawned, etc.)
             # "darwin"