feat(web-ui): refine TodoWrite card and widen compact header action type

- TodoWriteDisplay: layout, status slot, and SCSS cleanup for standard mode
- CompactToolCardHeader: allow ReactNode for action so inline stats cluster type-checks

Verified: pnpm run lint:web, pnpm run type-check:web, pnpm --dir src/web-ui run test:run

Author: GCWing

src/web-ui/src/flow_chat/tool-cards/CompactToolCard.tsx

@@ -104,8 +104,8 @@ export interface CompactToolCardHeaderProps {
   onAffordanceClick?: (e: React.MouseEvent<HTMLButtonElement>) => void;
   /** Whether to show the left icon divider (default false for compact) */
   showDivider?: boolean;
-  /** Action text */
-  action?: string;
+  /** Action label (text or inline markup) */
+  action?: ReactNode;
   /** Main content */
   content?: ReactNode;
   /** Right extra content (e.g., statistics) */