fix: update CP immediately after predicting

[SylvainChevalier]

Closes #4437

Summary

• After submitting a prediction, fetch fresh post data (including updated CP) from the API, matching the reaffirm flow pattern
• Previously, the predict flow relied solely on revalidatePath which didn't reliably update the client-side CP display

Test plan

• Predict on a binary question and verify the CP updates immediately
• Predict on a continuous question and verify the CP updates
• Predict on a multiple choice question and verify the CP updates
• Reaffirm a prediction and verify it still works correctly

Generated with Claude Code

[coderabbitai]

Important

Review skipped

Draft detected.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 53f85b2c-5da5-4a5b-9b4e-c1fd10ab01f7

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/issue-4437-update-the-cp-on-predict

📝 Coding Plan

• Generate coding plan for human review comments

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

Tip

CodeRabbit can generate a title for your PR based on the changes with custom instructions.

Set the reviews.auto_title_instructions setting to generate a title for your PR based on the changes in the PR with custom instructions.

[github-actions]

🚀 Preview Environment

Your preview environment is ready!

Resource	Details
🌐 Preview URL	https://metaculus-pr-4504-claude-issue-4437-update-the-c-preview.mtcl.cc
📦 Docker Image	ghcr.io/metaculus/metaculus:claude-issue-4437-update-the-cp-on-predict-021e1c6
🗄️ PostgreSQL	NeonDB branch preview/pr-4504-claude-issue-4437-update-the-c
⚡ Redis	Fly Redis mtc-redis-pr-4504-claude-issue-4437-update-the-c

Details

• Commit: 021e1c6f072bdc42a2f78c66f5b3508de1578380
• Branch: claude/issue-4437-update-the-cp-on-predict
• Fly App: metaculus-pr-4504-claude-issue-4437-update-the-c

---

ℹ️ Preview Environment Info

Isolation:

• PostgreSQL and Redis are fully isolated from production
• Each PR gets its own database branch and Redis instance
• Changes pushed to this PR will trigger a new deployment

Limitations:

• Background workers and cron jobs are not deployed in preview environments
• If you need to test background jobs, use Heroku staging environments

Cleanup:

• This preview will be automatically destroyed when the PR is closed