Add MapPage pagination and page-size selector; update Web-Design docs

frontend/src/pages/MapPage.tsx

@@ -25,7 +25,12 @@ import {
   makeStyles,
   tokens,
 } from "@fluentui/react-components";
-import { ArrowCounterclockwiseRegular, DismissRegular } from "@fluentui/react-icons";
+import {
+  ArrowCounterclockwiseRegular,
+  ChevronLeftRegular,
+  ChevronRightRegular,
+  DismissRegular,
+} from "@fluentui/react-icons";
 import { DashboardFilterBar } from "../components/DashboardFilterBar";
 import { WorldMap } from "../components/WorldMap";
 import { useMapData } from "../hooks/useMapData";
@@ -68,6 +73,15 @@ const useStyles = makeStyles({
     borderRadius: tokens.borderRadiusMedium,
     backgroundColor: tokens.colorNeutralBackground2,
   },
+  pagination: {
+    display: "flex",
+    alignItems: "center",
+    justifyContent: "space-between",
+    gap: tokens.spacingHorizontalS,
+    padding: `${tokens.spacingVerticalS} ${tokens.spacingHorizontalM}`,
+    borderTop: `1px solid ${tokens.colorNeutralStroke2}`,
+    backgroundColor: tokens.colorNeutralBackground2,
+  },
 });
 
 // ---------------------------------------------------------------------------
@@ -79,6 +93,10 @@ export function MapPage(): React.JSX.Element {
   const [range, setRange] = useState<TimeRange>("24h");
   const [originFilter, setOriginFilter] = useState<BanOriginFilter>("all");
   const [selectedCountry, setSelectedCountry] = useState<string | null>(null);
+  const [page, setPage] = useState<number>(1);
+  const [pageSize, setPageSize] = useState<number>(100);
+
+  const PAGE_SIZE_OPTIONS = [25, 50, 100] as const;
 
   const { countries, countryNames, bans, total, loading, error, refresh } =
     useMapData(range, originFilter);
@@ -99,6 +117,10 @@ export function MapPage(): React.JSX.Element {
     }
   }, [mapThresholdError]);
 
+  useEffect(() => {
+    setPage(1);
+  }, [range, originFilter, selectedCountry, bans, pageSize]);
+
   /** Bans visible in the companion table (filtered by selected country). */
   const visibleBans = useMemo(() => {
     if (!selectedCountry) return bans;
@@ -109,6 +131,15 @@ export function MapPage(): React.JSX.Element {
     ? (countryNames[selectedCountry] ?? selectedCountry)
     : null;
 
+  const totalPages = Math.max(1, Math.ceil(visibleBans.length / pageSize));
+  const hasPrev = page > 1;
+  const hasNext = page < totalPages;
+
+  const pageBans = useMemo(() => {
+    const start = (page - 1) * pageSize;
+    return visibleBans.slice(start, start + pageSize);
+  }, [visibleBans, page, pageSize]);
+
   return (
     <div className={styles.root}>
       {/* ---------------------------------------------------------------- */}
@@ -235,7 +266,7 @@ export function MapPage(): React.JSX.Element {
                   </TableCell>
                 </TableRow>
               ) : (
-                visibleBans.map((ban) => (
+                pageBans.map((ban) => (
                   <TableRow key={`${ban.ip}-${ban.banned_at}`}>
                     <TableCell>
                       <TableCellLayout>{ban.ip}</TableCellLayout>
@@ -282,6 +313,53 @@ export function MapPage(): React.JSX.Element {
               )}
             </TableBody>
           </Table>
+          <div className={styles.pagination}>
+            <div style={{ display: "flex", alignItems: "center", gap: tokens.spacingHorizontalS }}>
+              <Text size={200} style={{ color: tokens.colorNeutralForeground3 }}>
+                Showing {pageBans.length} of {visibleBans.length} filtered ban{visibleBans.length !== 1 ? "s" : ""}
+                {" · "}Page {page} of {totalPages}
+              </Text>
+
+              <div style={{ display: "flex", alignItems: "center", gap: tokens.spacingHorizontalS }}>
+                <Text size={200} style={{ color: tokens.colorNeutralForeground3 }}>
+                  Page size
+                </Text>
+                <select
+                  aria-label="Page size"
+                  value={pageSize}
+                  onChange={(event): void => {
+                    setPageSize(Number(event.target.value));
+                  }}
+                >
+                  {PAGE_SIZE_OPTIONS.map((option) => (
+                    <option key={option} value={option}>
+                      {option}
+                    </option>
+                  ))}
+                </select>
+              </div>
+            </div>
+            <div style={{ display: "flex", gap: tokens.spacingHorizontalXS }}>
+              <Button
+                icon={<ChevronLeftRegular />}
+                appearance="subtle"
+                disabled={!hasPrev}
+                onClick={(): void => {
+                  setPage(page - 1);
+                }}
+                aria-label="Previous page"
+              />
+              <Button
+                icon={<ChevronRightRegular />}
+                appearance="subtle"
+                disabled={!hasNext}
+                onClick={(): void => {
+                  setPage(page + 1);
+                }}
+                aria-label="Next page"
+              />
+            </div>
+          </div>
         </div>
       )}
     </div>