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/groups/ToolControls/ToolControls.stories.tsx

@@ -6,8 +6,6 @@ const meta: Meta<typeof ToolControls> = {
   title: "Groups/ToolControls",
   component: ToolControls,
   args: {
-    searchText: "",
-    onSearchChange: fn(),
     onRefreshList: fn(),
     onSelectTool: fn(),
     listChanged: false,
@@ -52,7 +50,6 @@ export const WithSelection: Story = {
 export const WithSearch: Story = {
   args: {
     tools: sampleTools,
-    searchText: "send",
   },
 };