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/LogStreamPanel/LogStreamPanel.stories.tsx

@@ -21,6 +21,8 @@ const meta: Meta<typeof LogStreamPanel> = {
     autoScroll: true,
     onToggleAutoScroll: fn(),
     onCopyAll: fn(),
+    onClear: fn(),
+    onExport: fn(),
   },
 };
 

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

@@ -19,6 +19,8 @@ export interface LogStreamPanelProps {
   autoScroll: boolean;
   onToggleAutoScroll: () => void;
   onCopyAll: () => void;
+  onClear: () => void;
+  onExport: () => void;
 }
 
 const PanelContainer = Paper.withProps({
@@ -61,6 +63,8 @@ export function LogStreamPanel({
   autoScroll,
   onToggleAutoScroll,
   onCopyAll,
+  onClear,
+  onExport,
 }: LogStreamPanelProps) {
   const filteredEntries = useMemo(
     () => entries.filter((e) => matchesFilters(e, filterText, visibleLevels)),
@@ -77,6 +81,8 @@ export function LogStreamPanel({
             checked={autoScroll}
             onChange={onToggleAutoScroll}
           />
+          <ToolbarButton onClick={onClear}>Clear</ToolbarButton>
+          <ToolbarButton onClick={onExport}>Export</ToolbarButton>
           <ToolbarButton onClick={onCopyAll}>Copy All</ToolbarButton>
         </Group>
       </Group>