Fix: similar questions sidebar tiles not showing user forecasts

[ncarazon]

Resolves #4792

Summary

Sidebar similar question tiles were not displaying the user's own forecast ("Me: X%"), even though the main feed tiles showed them correctly.

Implemented changes:

• posts/views.py: post_similar_posts_api_view was calling serialize_post_many() without include_user_forecasts=True, so my_forecasts was never included in the similar posts API response.

• posts.shared.ts: getSimilarPosts used next: { revalidate: 1800 }, which triggers a security guard in the server fetcher that intentionally strips the auth token from cached requests to prevent leaking user-specific data across a shared cache. Without the auth token, the backend treats the request as unauthenticated and skips user forecast data regardless of the backend fix. Removing revalidate makes the request dynamic and auth-bearing — the backend's own 24h Redis cache for get_similar_posts() ensures performance is not impacted.

Screenshots

Before

After

Summary by CodeRabbit

• New Features
  • Similar posts recommendations now include personalized user forecast data, providing users with additional forecasting context alongside related content suggestions.

[coderabbitai]

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[ncarazon]

Highlighting this for BE engineer to review. Without include_user_forecasts=True, the similar posts endpoint always returns unauthenticated responses – omitting my_forecasts from the payload and causing sidebar tiles to never show the user's own forecast

[github-actions]

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