Refactor DashboardFilterBar to use props exclusively, eliminate dual state source

- DashboardFilterBar now requires all filter props (timeRange, onTimeRangeChange, originFilter, onOriginFilterChange) instead of falling back to context
- Removed useDashboardFilters() hook dependency from DashboardFilterBar, BanTrendChart, and JailDistributionChart
- Updated DashboardPage to explicitly pass all filter values and callbacks from context to components
- Made props required on BanTrendChart and JailDistributionChart
- Updated all tests to reflect new prop requirements
- This eliminates the silent dual-source behavior that could lead to subtle bugs when components are used with different data sources

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

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

@@ -4,9 +4,19 @@ import userEvent from "@testing-library/user-event";
 import { DashboardFilterBar } from "../../components/DashboardFilterBar";
 import { DashboardFilterProvider, useDashboardFilters } from "../DashboardFilterProvider";
 
-function DashboardFilterSummary(): React.JSX.Element {
-  const { timeRange, originFilter } = useDashboardFilters();
-  return <div data-testid="dashboard-filters">{`${timeRange}-${originFilter}`}</div>;
+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", () => {
@@ -15,8 +25,7 @@ describe("DashboardFilterProvider", () => {
 
     render(
       <DashboardFilterProvider>
-        <DashboardFilterBar />
-        <DashboardFilterSummary />
+        <DashboardFilterContent />
       </DashboardFilterProvider>,
     );