Bug: Do not increment page when fetching is not done

[hansrajkvb]

Bug

In the IModelGrid, when the access token or itwinid does not get loaded in time (usually on first render), no fetching occurs, but page still gets incremented.
When page gets incremented, $skip also gets incremented to ignore the first page of imodels. But in this case the fetching never happened, so the first page of imodels is never fetched.

Fix

When access token or itwinid is not yet loaded, return early so that page is not incorrectly incremented.

[alexdunae]

lgtm

[Copilot]

Pull Request Overview

This PR fixes a bug in the IModelGrid where pagination incorrectly increments when prerequisites (access token or iTwin ID) are not yet available, causing the first page of data to be skipped.

• Added early return conditions to prevent page increment when token or context is not available
• Added comprehensive test coverage for both missing access token and iTwin ID scenarios

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
useIModelData.ts	Added status checks for TokenRequired and ContextRequired to prevent premature page incrementation
useIModelData.test.ts	Added parameterized test to verify pagination behavior when prerequisites are missing
hans-fix_imodel_fetch_when_not_yet_loaded_2025-10-10-02-55.json	Added changelog entry documenting the bug fix

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