Update the iModel table to show "Last Modified" instead of "Created Date"

[arome]

The iModel table now displays the Last Modified date which corresponds to the lastChangesetPushDateTime on that iModel.
If the lastChangesetPushDateTime is null for an iModel we're displaying its created date.

[Copilot]

Pull request overview

Updates the iModel “cells” table column from showing the iModel’s Created Date to showing a “Last Modified” date based on lastChangesetPushDateTime, with a fallback to createdDateTime when the last changeset date is null.

Changes:

• Added lastChangesetPushDateTime to IModelFull and updated the iModel table to render/sort using last modified (with fallback to created date).
• Renamed the column/string identifiers from “Created Date” to “Last Modified”.
• Renamed the corresponding cell override hook from createdDateTime to lastModified.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
packages/modules/imodel-browser/src/types.ts	Adds the new iModel date field and renames the exposed column/override identifiers.
packages/modules/imodel-browser/src/containers/iModelGrid/useIModelTableConfig.tsx	Switches the table column header/accessor/cell rendering to last-modified semantics.
packages/modules/imodel-browser/src/containers/iModelGrid/IModelGrid.tsx	Updates the default UI string to “Last Modified”.

Comments suppressed due to low confidence (1)

packages/modules/imodel-browser/src/containers/iModelGrid/useIModelTableConfig.tsx:30

• Renaming IModelTableStrings.tableColumnCreatedDate to tableColumnLastModified is a breaking change for consumers using stringsOverrides/custom strings. To avoid forcing downstream changes, consider supporting both keys (with tableColumnCreatedDate marked deprecated) and falling back appropriately.

export interface IModelTableStrings {
  /** Displayed for table name header. */
  tableColumnName: string;
  /** Displayed for table description header. */
  tableColumnDescription: string;
  /** Displayed for table last modified date header. */
  tableColumnLastModified: string;
  /** Displayed for table favorites header. */
  tableColumnFavorites: string;
  /** Text for adding an iModel to favorites. */
  addToFavorites: string;
  /** Text for removing an iModel from favorites. */
  removeFromFavorites: string;

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