fix(office): render xlsx error condition rules

Co-authored-by: Codex (GPT 5.5) <codex@openai.com>

Author: phodal

docs/issues/2026-05-01-office-document-viewer-wasm-reader.md

@@ -123,6 +123,7 @@ Routa 应能在 session canvas 或 artifact tab 中直接预览 Office 文档（
 - XLSX conditional-format protocol parity now emits Walnut `CfRule` fields for `aboveAverage`, `bottom`, `rank`, `stdDev`, `equalAverage`, and `timePeriod`; the debug preview also evaluates Excel serial-date time-period rules such as `last7Days` and `thisMonth`.
 - XLSX conditional-format precedence now sorts decoded rules by Excel/Walnut `priority` and applies `stopIfTrue` consistently across format, color-scale, data-bar, and icon-set visuals instead of relying on protocol array order.
 - XLSX `cellIs` conditional-format comparisons now resolve formula thresholds from absolute/relative cell references, defined names, and common date helpers such as `DATE(...)` and `TODAY()` before applying comparison operators.
+- XLSX conditional-format preview now applies Excel error-value rules for `containsErrors` and `notContainsErrors`, covering common values such as `#DIV/0!`, `#N/A`, `#REF!`, and `#VALUE!`.
 
 ## Codex 技术方案逆向分析
 

src/app/debug/office-wasm-poc/__tests__/spreadsheet-conditional-visuals.test.ts

@@ -445,6 +445,43 @@ describe("spreadsheet conditional visuals", () => {
     expect(visuals.get("4:3")).toBeUndefined();
   });
 
+  it("applies error-value conditional format rules", () => {
+    const visuals = buildSpreadsheetConditionalVisuals({
+      conditionalFormattings: [
+        {
+          ranges: ["A1:A3"],
+          rules: [
+            {
+              fillColor: "FCA5A5",
+              type: "containsErrors",
+            },
+          ],
+        },
+        {
+          ranges: ["B1:B3"],
+          rules: [
+            {
+              fillColor: "BBF7D0",
+              type: "notContainsErrors",
+            },
+          ],
+        },
+      ],
+      rows: [
+        { cells: [{ address: "A1", value: "#DIV/0!" }, { address: "B1", value: "#REF!" }], index: 1 },
+        { cells: [{ address: "A2", value: "#N/A" }, { address: "B2", value: "ok" }], index: 2 },
+        { cells: [{ address: "A3", value: "ok" }, { address: "B3", value: 42 }], index: 3 },
+      ],
+    });
+
+    expect(visuals.get("1:0")?.background).toBe("#FCA5A5");
+    expect(visuals.get("2:0")?.background).toBe("#FCA5A5");
+    expect(visuals.get("3:0")).toBeUndefined();
+    expect(visuals.get("1:1")).toBeUndefined();
+    expect(visuals.get("2:1")?.background).toBe("#BBF7D0");
+    expect(visuals.get("3:1")?.background).toBe("#BBF7D0");
+  });
+
   it("applies duplicate and unique value conditional format rules", () => {
     const visuals = buildSpreadsheetConditionalVisuals({
       conditionalFormattings: [

src/app/debug/office-wasm-poc/spreadsheet-conditional-visuals.ts

@@ -804,6 +804,14 @@ function conditionalTextMatches(
     return normalizedText.length > 0;
   }
 
+  if (type === "containsErrors") {
+    return spreadsheetErrorValueMatches(normalizedText);
+  }
+
+  if (type === "notContainsErrors") {
+    return !spreadsheetErrorValueMatches(normalizedText);
+  }
+
   if (type === "duplicateValues") {
     return normalizedText.length > 0 && (textCounts?.get(normalizedText) ?? 0) > 1;
   }
@@ -875,6 +883,21 @@ function conditionalTextMatches(
   return false;
 }
 
+function spreadsheetErrorValueMatches(text: string): boolean {
+  const normalized = text.toUpperCase();
+  return normalized === "#DIV/0!" ||
+    normalized === "#N/A" ||
+    normalized === "#NAME?" ||
+    normalized === "#NULL!" ||
+    normalized === "#NUM!" ||
+    normalized === "#REF!" ||
+    normalized === "#VALUE!" ||
+    normalized === "#SPILL!" ||
+    normalized === "#CALC!" ||
+    normalized === "#FIELD!" ||
+    normalized === "#GETTING_DATA";
+}
+
 function conditionalCellFormulaNumber(
   formula: unknown,
   definedNames?: unknown,