feat(billing): highlight matched conditional multipliers in logs (#6561)

* feat(billing): highlight matched conditional multipliers in usage logs

* fix(billing): make request rule tracing stable and type-safe

web/src/features/usage-logs/components/dialogs/details-dialog.tsx

@@ -1078,6 +1078,7 @@ export function DetailsDialog(props: DetailsDialogProps) {
               compact
               billingExpr={decodeBillingExprB64(other.expr_b64)}
               matchedTierLabel={other.matched_tier}
+              requestRules={other.request_rules}
               hideCacheColumns={!hasAnyCacheTokens(other)}
             />
           </DetailSection>

web/src/features/usage-logs/types.ts

@@ -19,8 +19,9 @@ For commercial licensing, please contact support@quantumnous.com
 /**
  * Type definitions for usage logs
  */
-import type { UsageLog } from './data/schema'
+import type { RequestRuleTrace } from '@/features/pricing/lib/billing-expr'
 
+import type { UsageLog } from './data/schema'
 // ============================================================================
 // Log Category Types
 // ============================================================================
@@ -189,10 +190,12 @@ export interface LogOtherData {
   frt?: number
   // Tiered (expression-based) billing fields, set by backend when
   // billing_mode === 'tiered_expr'. expr_b64 is the base64-encoded billing
-  // expression and matched_tier is the label of the tier that fired.
+  // expression; the matched tier and request-rule traces come from the actual
+  // settlement run.
   billing_mode?: string
   expr_b64?: string
   matched_tier?: string
+  request_rules?: RequestRuleTrace[]
   reasoning_effort?: string
   image?: boolean
   image_ratio?: number