Move search state into ToolControls and PromptControls, search response in history

- ToolControls and PromptControls now manage searchText as local state
  and filter their lists internally (matches on name + title/description)
- Removed searchText/onSearchChange props from ToolsScreen, PromptsScreen,
  and their associated stories
- HistoryListPanel search now also matches against stringified response
  payloads

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

clients/web/src/components/screens/ToolsScreen/ToolsScreen.stories.tsx

@@ -10,9 +10,7 @@ const meta: Meta<typeof ToolsScreen> = {
   component: ToolsScreen,
   parameters: { layout: "fullscreen" },
   args: {
-    searchText: "",
     listChanged: false,
-    onSearchChange: fn(),
     onRefreshList: fn(),
     onSelectTool: fn(),
   },