#2012: split a parsed sheet-qualified name at the last !, sheet as is

Addresses review comments 4455115540 and 4455115557. The parser stores
`'Sheet'!Name` as `Sheet!Name` with the sheet already unquoted:

- Evaluator::name split it at the first `!`, so a series named
  `'a!b'!Title` showed #NAME?.
- chart_name unquoted it again, trimming spaces, so a chart reference
  to `' Sales '!Data` was saved as `Sales!Data`.

Both now split at the last `!` and look the sheet up as is.

Tests: chart tests::a_series_named_by_a_name_on_a_sheet_with_a_bang_resolves,
xlsx tests::chart_book_names::chart_names_keep_spaces_around_a_quoted_sheet_name.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/chart/src/tests.rs

@@ -1294,3 +1294,39 @@ fn a_series_named_by_a_name_on_a_sheet_with_an_apostrophe_resolves() {
     let d = resolve(&wb, 0, &c);
     assert_eq!(d.series.first().map(|s| s.name.as_str()), Some("Takings"));
 }
+
+#[test]
+fn a_series_named_by_a_name_on_a_sheet_with_a_bang_resolves() {
+    // `'a!b'!Title`: the sheet name holds a `!`, so the evaluator must split the parsed name at
+    // the last one, not the first.
+    let mut wb = Workbook::new();
+    {
+        let s = wb.sheet_mut(0).unwrap();
+        s.name = "a!b".into();
+        s.set_value(CellRef::new(0, 0), Value::from("Takings"));
+        s.set_value(CellRef::new(1, 0), Value::Number(4.0));
+        s.set_value(CellRef::new(2, 0), Value::Number(9.0));
+    }
+    wb.names.push(gridcraft_model::DefinedName {
+        name: "Title".into(),
+        scope: Some(0),
+        formula: "'a!b'!$A$1".into(),
+        comment: String::new(),
+        hidden: false,
+    });
+    let mut c = chart(ChartKind::ColumnClustered);
+    c.series = vec![Series {
+        name: Some("'a!b'!Title".into()),
+        categories: None,
+        values: "'a!b'!$A$2:$A$3".into(),
+        bubble_sizes: None,
+        color: None,
+        secondary: false,
+        kind: None,
+        quartiles: Default::default(),
+        smooth: false,
+        trendlines: Vec::new(),
+    }];
+    let d = resolve(&wb, 0, &c);
+    assert_eq!(d.series.first().map(|s| s.name.as_str()), Some("Takings"));
+}