refactor(web): sweep AGENTS.md TypeScript + Mantine rule violations (#1771)

Codebase-wide sweep bringing the web client into strict compliance with the AGENTS.md TypeScript and Mantine/React conventions: ~170 inline 2+-static-prop elements extracted to named .withProps() constants across ~77 files, the AGENTS.md rule wording tightened to match (static-prop boundary + Accordion/Transition/data-*/Box exemptions), a real ScreenStage Box->Flex layout regression fixed (direction: column) with a Storybook regression guard, and an App.tsx double-cast tightened. Closes #1762.

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

@@ -35,6 +35,11 @@ const ClearHistoryButton = Button.withProps({
   size: "sm",
 });
 
+const HeaderRow = Group.withProps({
+  justify: "space-between",
+  mb: "sm",
+});
+
 const EmptyState = Text.withProps({
   c: "dimmed",
   ta: "center",
@@ -110,7 +115,7 @@ export function TaskListPanel({
 
   return (
     <PanelContainer>
-      <Group justify="space-between" mb="sm">
+      <HeaderRow>
         <Title order={4}>Tasks</Title>
         {hasResults && (
           <ListToggle
@@ -118,7 +123,7 @@ export function TaskListPanel({
             onToggle={() => setCompact((c) => !c)}
           />
         )}
-      </Group>
+      </HeaderRow>
 
       {!hasResults ? (
         <EmptyState>No tasks</EmptyState>