Remove unused imports in Plugin & ToolPicker

Clean up unused imports and variables: remove useMemo import from PluginSection, drop unused Badge and Text imports from ToolPicker, and remove unused workflow setters (setLeftPanelView, setReaderMode, setSearchQuery) from the ToolPicker destructure. These are housekeeping changes to address linter warnings and reduce dead code.

frontend/src/core/components/shared/config/configSections/PluginSection.tsx

@@ -1,4 +1,4 @@
-import React, { useEffect, useMemo, useState } from "react";
+import React, { useEffect, useState } from "react";
 import { Paper, Text, Group, Stack, Badge, Divider, Avatar, Tooltip } from "@mantine/core";
 import { useTranslation } from "react-i18next";
 import { usePluginRegistry } from "@app/contexts/PluginRegistryContext";

frontend/src/core/components/tools/ToolPicker.tsx

@@ -1,5 +1,5 @@
 import React, { useEffect, useMemo, useRef } from "react";
-import { Badge, Box, Button, Stack, Text } from "@mantine/core";
+import { Box, Button, Stack } from "@mantine/core";
 import { useTranslation } from "react-i18next";
 import { ToolRegistryEntry } from "@app/data/toolsTaxonomy";
 import "@app/components/tools/toolPicker/ToolPicker.css";
@@ -34,9 +34,6 @@ const ToolPicker = ({ selectedToolKey, onSelect, filteredTools, isSearching = fa
   const {
     favoriteTools,
     toolRegistry,
-    setLeftPanelView,
-    setReaderMode,
-    setSearchQuery,
   } = useToolWorkflow();
 
   const favoriteToolItems = useFavoriteToolItems(favoriteTools, toolRegistry);