fix: hide Pages nav item from guests with no accessible pages

[okxint]

Description

When guest_view_all_features is off, the backend restricts guests to only the pages they own. A guest who hasn't created any pages lands on an empty Pages section with no explanation — the nav link is visible but the content area is empty.

Cycles and Modules already exclude GUEST from their access arrays in project-navigation.tsx. This PR does the same for Pages to be consistent and avoid the confusing empty state.

Type of Change

• Bug fix (non-breaking change which fixes an issue)

Test Scenarios

1. Create a workspace with a guest user (no pages created by the guest)
2. Verify the Pages nav item is no longer visible in the sidebar
3. Verify admin and member users still see Pages

References

Fixes #9103

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