🤖 tests: stabilize landing page workspace ordering

[ammar-agent]

Summary

Landing page "Recent Workspaces" cards could reorder between Storybook/Chromatic runs when multiple workspaces shared the same recency timestamp. This change makes the sort deterministic so snapshots stay stable.

Background

The new landing page sorts recent workspaces by recency only. In Storybook fixtures, recency ties are common, and map insertion order can vary enough to produce inconsistent card ordering.

Implementation

• Updated RecentWorkspacesSection in LandingPage.tsx to keep recency as the primary key.
• Added deterministic tie-breakers in this order: createdAt (desc), name (asc), id (asc).
• Documented why the tie-breakers are necessary for Storybook/Chromatic stability.

Validation

• make static-check

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[ammar-agent]

@codex review

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