fix(web): 修復 ApprovalCard disabled → readOnly

TypeScript 錯誤: disabled prop 不存在，改用 readOnly

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/web/src/components/approval/live-approval-panel.tsx

@@ -298,7 +298,7 @@ export function LiveApprovalPanel({
               onReject={() => handleReject(approval.id)}
               holdDuration={2000}
               isLoading={signingStates[approval.id] === 'signing'}
-              disabled={isResolved}
+              readOnly={isResolved}
             />
 
             {/* Permission Warning Badge (Phase 3) */}