fix(network): expose category toggle state via aria-pressed

The category UnstyledButtons in NetworkControls previously communicated
their toggled state only via background color. Adds aria-pressed={active}
so assistive tech can discover the on/off state without visuals, with a
test that asserts the attribute tracks the visibleCategories prop.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: cliffhall

clients/web/src/components/groups/NetworkControls/NetworkControls.test.tsx

@@ -32,6 +32,23 @@ describe("NetworkControls", () => {
     expect(onFilterChange).toHaveBeenLastCalledWith("x");
   });
 
+  it("reflects category visibility via aria-pressed", () => {
+    renderWithMantine(
+      <NetworkControls
+        {...baseProps}
+        visibleCategories={{ auth: true, transport: false }}
+      />,
+    );
+    expect(screen.getByRole("button", { name: "auth" })).toHaveAttribute(
+      "aria-pressed",
+      "true",
+    );
+    expect(screen.getByRole("button", { name: "transport" })).toHaveAttribute(
+      "aria-pressed",
+      "false",
+    );
+  });
+
   it("fires onToggleCategory with inverted visibility when clicked", async () => {
     const user = userEvent.setup();
     const onToggleCategory = vi.fn();

clients/web/src/components/groups/NetworkControls/NetworkControls.tsx

@@ -62,6 +62,7 @@ export function NetworkControls({
               w="100%"
               p="sm"
               variant="listItem"
+              aria-pressed={active}
               bg={active ? "var(--mantine-primary-color-light)" : undefined}
               onClick={() => onToggleCategory(category, !active)}
             >