Inline ListChangedIndicator with titles, normalize screen gaps, and rename ResultPanel to ToolResultPanel

- Place ListChangedIndicator on same line as section titles using Group with space-between in ToolControls, ResourceControls, and PromptControls
- Add ListChanged stories for ResourceControls and show indicators in ConnectedView stories
- Normalize ScreenLayout gap from "xl" to "md" across all screens for consistent spacing
- Rename ResultPanel to ToolResultPanel (component, interface, files, and stories)
- Replace Grid layout in ToolsScreen with equal-width flex children for detail and result panels

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

clients/web/src/components/groups/ResourceControls/ResourceControls.stories.tsx

@@ -63,6 +63,13 @@ export const WithSearch: Story = {
   },
 };
 
+export const ListChanged: Story = {
+  args: {
+    ...Default.args,
+    listChanged: true,
+  },
+};
+
 export const Empty: Story = {
   args: {
     resources: [],