test(web): add 23 edge-case tests across UI components and lib utils

Covers: aria-sort/aria-labelledby attributes, non-Error throws in
ErrorBoundary, NaN/MAX_SAFE_INTEGER in formatCents, invalid dates,
carriage returns in CSV, self-closing HTML tags in sanitize, non-digit
input in DateInput, panel-click-not-dismissing in ConfirmDialog,
role="search" on FilterBar.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/web/src/lib/csv-export.test.ts

@@ -126,4 +126,21 @@ describe("generateCsv", () => {
     expect(lines[1]).toBe("abc");
     expect(lines[2]).toBe("abc");
   });
+
+  it("does NOT quote a cell value that contains only a carriage return (\\r is not in the escape list)", () => {
+    // The escapeCsvValue function checks for '\n' but not '\r'.
+    // A bare \r is therefore left unquoted.
+    const crCols = [{ header: "Field", accessor: (_r: unknown) => "line1\rline2" }];
+    const csv = generateCsv([{}], crCols);
+    const dataLine = csv.split("\n")[1];
+    // Because \r is not special-cased, the value is NOT wrapped in quotes
+    expect(dataLine).toBe("line1\rline2");
+  });
+
+  it("empty columns array produces just a newline for no rows", () => {
+    // header = "" (no columns), body = "" (no rows)
+    // result = "" + "\n" + "" = "\n"
+    const csv = generateCsv([], []);
+    expect(csv).toBe("\n");
+  });
 });