Normalize screen layouts: extract control groups, unify sidebar widths, and refactor PromptsScreen

- Extract ToolControls group from ToolsScreen (search, list, list-changed indicator)
- Extract PromptControls and PromptListItem groups for PromptsScreen sidebar
- Refactor PromptsScreen to sidebar + detail layout (matching ResourcesScreen pattern)
- Refactor PromptArgumentsForm to accept a single prompt instead of a dropdown
- Normalize all screen sidebar widths to 340px (Tools, Resources, Prompts, Logs, Tasks, History)
- Convert ToolsScreen from Grid-only to sidebar + Grid layout
- Replace LogControls checkboxes with full-width toggle buttons
- Move Clear/Export buttons from LogControls to LogStreamPanel toolbar
- Make PromptArgumentsForm "Get Prompt" button right-aligned and compact
- Update all affected stories and ConnectedView

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

clients/web/src/components/groups/PromptControls/PromptControls.tsx

@@ -0,0 +1,55 @@
+import { ScrollArea, Stack, TextInput, Title } from "@mantine/core";
+import { ListChangedIndicator } from "../../elements/ListChangedIndicator/ListChangedIndicator";
+import { PromptListItem } from "../PromptListItem/PromptListItem";
+import type { PromptItem } from "../../screens/PromptsScreen/PromptsScreen";
+
+export interface PromptControlsProps {
+  prompts: PromptItem[];
+  listChanged: boolean;
+  searchText: string;
+  onSearchChange: (text: string) => void;
+  onRefreshList: () => void;
+  onSelectPrompt: (name: string) => void;
+}
+
+function listMaxHeight(): string {
+  return "calc(100vh - var(--app-shell-header-height, 0px) - var(--mantine-spacing-xl) * 2 - 160px)";
+}
+
+export function PromptControls({
+  prompts,
+  listChanged,
+  searchText,
+  onSearchChange,
+  onRefreshList,
+  onSelectPrompt,
+}: PromptControlsProps) {
+  const filteredPrompts = prompts.filter((p) =>
+    p.name.toLowerCase().includes(searchText.toLowerCase()),
+  );
+
+  return (
+    <Stack gap="sm">
+      <Title order={4}>Prompts</Title>
+      <ListChangedIndicator visible={listChanged} onRefresh={onRefreshList} />
+      <TextInput
+        placeholder="Search prompts..."
+        value={searchText}
+        onChange={(e) => onSearchChange(e.currentTarget.value)}
+      />
+      <ScrollArea.Autosize mah={listMaxHeight()}>
+        <Stack gap="xs">
+          {filteredPrompts.map((prompt) => (
+            <PromptListItem
+              key={prompt.name}
+              name={prompt.name}
+              description={prompt.description}
+              selected={prompt.selected}
+              onClick={() => onSelectPrompt(prompt.name)}
+            />
+          ))}
+        </Stack>
+      </ScrollArea.Autosize>
+    </Stack>
+  );
+}