fix(repositories): keep deep-linked ?page=N when search hasn't changed

The repositories leaderboard table routes `DebouncedSearchInput`'s
`onDebouncedChange` through `useDataTableParams.setFilter('search', ...)`,
whose `useCallback` closes over `react-router-dom`'s `setSearchParams`.
That ref is recreated on every URL change, so every `setPage(N)` recreates
the callback, which re-fires the wrapper's mount-anchored debounce effect.
The fired commit deletes `?page` via the filter's default
`resetPageOnChange`, snapping the table back to page 1 right after the
click.

Same root cause #1108 fixed for `MinerPRsTable`. Apply the same callsite
gate: keep the latest committed `searchQuery` in a ref and skip
`setFilter('search', ...)` when the wrapper hands back the value we
already hold. Typing a new search still commits normally and resets
`?page` as intended; the mount fire and any re-render driven by an
unrelated URL change no longer touches the page slot.

Verified locally:
- Direct load `/repositories?page=1` retains `?page=1` and renders rows
  13-15 of 15.
- "Go to next page" / "Go to last page" advance to `?page=1` and stay.
- Typing into the search input still commits the filter after the
  debounce and resets `?page` so the result list starts at page 1.
- `npm run build`, `npm run lint`, `npx prettier --check` all clean.

Author: ai-mountain

src/components/leaderboard/TopRepositoriesTable.tsx

@@ -1,4 +1,10 @@
-import React, { useState, useMemo, useCallback } from 'react';
+import React, {
+  useState,
+  useMemo,
+  useCallback,
+  useRef,
+  useEffect,
+} from 'react';
 import {
   Box,
   Card,
@@ -256,8 +262,17 @@ const TopRepositoriesTable: React.FC<TopRepositoriesTableProps> = ({
   const [showChart, setShowChart] = useState(false);
   const [useLogScale, setUseLogScale] = useState(true);
 
+  const searchQueryRef = useRef(searchQuery);
+  useEffect(() => {
+    searchQueryRef.current = searchQuery;
+  });
+
   const handleSearchChange = useCallback(
-    (value: string) => setFilter('search', value),
+    (value: string) => {
+      if (value === searchQueryRef.current) return;
+      searchQueryRef.current = value;
+      setFilter('search', value);
+    },
     [setFilter],
   );