Refactor: Move DashboardFilterProvider to pages directory

- Move DashboardFilterProvider component and tests from providers/ to pages/
- Update DashboardPage imports to reflect new structure
- Update documentation with latest task progress

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

frontend/src/pages/__tests__/DashboardFilterProvider.test.tsx

@@ -0,0 +1,40 @@
+import { describe, expect, it } from "vitest";
+import { render, screen } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import { DashboardFilterBar } from "../../components/DashboardFilterBar";
+import { DashboardFilterProvider, useDashboardFilters } from "../DashboardFilterProvider";
+
+function DashboardFilterContent(): React.JSX.Element {
+  const { timeRange, originFilter, setTimeRange, setOriginFilter } = useDashboardFilters();
+  return (
+    <>
+      <DashboardFilterBar
+        timeRange={timeRange}
+        onTimeRangeChange={setTimeRange}
+        originFilter={originFilter}
+        onOriginFilterChange={setOriginFilter}
+      />
+      <div data-testid="dashboard-filters">{`${timeRange}-${originFilter}`}</div>
+    </>
+  );
+}
+
+describe("DashboardFilterProvider", () => {
+  it("provides filter state to DashboardFilterBar and updates when the user clicks", async () => {
+    const user = userEvent.setup();
+
+    render(
+      <DashboardFilterProvider>
+        <DashboardFilterContent />
+      </DashboardFilterProvider>,
+    );
+
+    expect(screen.getByTestId("dashboard-filters")).toHaveTextContent("24h-all");
+
+    await user.click(screen.getByRole("button", { name: /Last 7 days/i }));
+    expect(screen.getByTestId("dashboard-filters")).toHaveTextContent("7d-all");
+
+    await user.click(screen.getByRole("button", { name: /Blocklist/i }));
+    expect(screen.getByTestId("dashboard-filters")).toHaveTextContent("7d-blocklist");
+  });
+});