fix: DH-20734: Datetime tooltip shown on wrong column when column is moved (#2554)

- Raw grid indices instead of model indices were being passed to
`IrisGridTableModelTemplate.tooltipForCell()`, causing tooltips for a
column to be shown in the wrong column if that column is moved

Test snippet (any table with a datetime column)
```python
import deephaven.plot.express as dx

my_table = dx.data.stocks()
```

Author: ericlln

packages/iris-grid/src/IrisGridModel.ts

@@ -7,7 +7,6 @@ import {
   type GridCell,
   GridModel,
   type GridRange,
-  type GridRangeIndex,
   type GridThemeType,
   type ModelIndex,
   type MoveOperation,
@@ -644,7 +643,7 @@ abstract class IrisGridModel<
     throw new Error('Method not implemented.');
   }
 
-  tooltipForCell(column: GridRangeIndex, row: GridRangeIndex): string | null {
+  tooltipForCell(column: ModelIndex, row: ModelIndex): string | null {
     return null;
   }
 }

packages/iris-grid/src/IrisGridTableModelTemplate.ts

@@ -7,7 +7,6 @@ import {
   type EditableGridModel,
   type EditOperation,
   GridRange,
-  type GridRangeIndex,
   GridUtils,
   memoizeClear,
   type ModelIndex,
@@ -685,8 +684,7 @@ class IrisGridTableModelTemplate<
     return null;
   }
 
-  tooltipForCell(column: GridRangeIndex, row: GridRangeIndex): string | null {
-    if (column === null || row === null) return null;
+  tooltipForCell(column: ModelIndex, row: ModelIndex): string | null {
     if (TableUtils.isDateType(this.columns[column].type)) {
       return this.displayString(
         this.valueForCell(column, row),

packages/iris-grid/src/mousehandlers/IrisGridTokenMouseHandler.tsx

@@ -41,7 +41,12 @@ class IrisGridTokenMouseHandler extends GridTokenMouseHandler {
   onMove(gridPoint: GridPoint, grid: Grid): EventHandlerResult {
     const { model } = this.irisGrid.props;
     const isUserHoveringLink = this.isHoveringLink(gridPoint, grid);
-    const tooltip = model.tooltipForCell(gridPoint.column, gridPoint.row);
+    const modelColumn = this.irisGrid.getModelColumn(gridPoint.column);
+    const modelRow = this.irisGrid.getModelRow(gridPoint.row);
+    const tooltip =
+      modelColumn != null && modelRow != null
+        ? model.tooltipForCell(modelColumn, modelRow)
+        : null;
 
     if (
       isUserHoveringLink &&