fix: retain separate cache reads in historical Claude totals

Co-Authored-By: Paperclip <noreply@paperclip.ing>

ui/src/lib/cost-reporting.test.ts

@@ -19,6 +19,14 @@ describe("cost presentation", () => {
     expect(visibleRunCostUsd({ billingType: "subscription_included", costUsd: 50 })).toBe(0);
   });
 
+  it("includes separate legacy Claude cache reads without changing legacy Codex totals", () => {
+    const tokens = { inputTokens: 100, cachedInputTokens: 80, outputTokens: 10 };
+    expect(visibleRunTokenTotal({ ...tokens, provider: "anthropic" })).toBe(190);
+    expect(visibleRunTokenTotal({ ...tokens, provider: "openai" })).toBe(110);
+    expect(visibleRunTokenTotal({ ...tokens, provider: "anthropic", accountingReceiptId: "saved-receipt" })).toBe(190);
+    expect(visibleRunTokenTotal({ provider: "anthropic", input_tokens: 100, cache_read_input_tokens: 80, output_tokens: 10 })).toBe(190);
+  });
+
   it("formats finance amounts in their recorded currency", () => {
     expect(formatCents(123, "USD")).toBe("$1.23");
     expect(formatCents(123, "EUR")).toBe("€1.23");

ui/src/lib/utils.ts

@@ -179,8 +179,9 @@ function readRunCostUsd(payload: Record<string, unknown> | null): number | null
   return null;
 }
 
-/** Receipt-backed runs store uncached input separately. Older run snapshots
- * retain their original input total (Codex included cached input in it). */
+/** Receipt-backed runs and legacy Claude snapshots store uncached input
+ * separately. Older Codex input already includes its cached tokens. Unknown
+ * legacy formats retain their original input-plus-output interpretation. */
 export function visibleRunTokenTotal(usage: Record<string, unknown> | null | undefined): number {
   const count = (...keys: string[]) => {
     for (const key of keys) {
@@ -192,7 +193,9 @@ export function visibleRunTokenTotal(usage: Record<string, unknown> | null | und
   const input = count("inputTokens", "input_tokens");
   const output = count("outputTokens", "output_tokens");
   const cached = count("cachedInputTokens", "cached_input_tokens", "cache_read_input_tokens");
-  return input + output + (typeof usage?.accountingReceiptId === "string" && usage.accountingReceiptId.length > 0 ? cached : 0);
+  const inputExcludesCached = usage?.provider === "anthropic"
+    || (typeof usage?.accountingReceiptId === "string" && usage.accountingReceiptId.length > 0);
+  return input + output + (inputExcludesCached ? cached : 0);
 }
 
 export function visibleRunCostUsd(