Empty / pre-CP-reveal audit for the new side-by-side row

[ncarazon]

Summary

This PR audits and fixes the three hidden-CP states - user preference (hideCP), pre-reveal time (cpRevealsOn), and no forecasts yet (isEmpty) - across the new side-by-side question layout introduced in the previous PR.

Implemented fixes:

• Continuous left panel (QuestionHeaderCPStatus): restructured into three early-return states - empty outline box with a centered "Current estimate" label when isEmpty, centered UpcomingCP countdown when cpRevealsOn, centered RevealCPButton when hideCP - so the column width is always preserved and the correct state is always shown
• Binary left panel (QuestionHeaderCPStatus): added hideCP early return that renders a centered RevealCPButton inside the fixed-width container for both forecaster desktop and mobile
• Consumer continuous mobile (ContinuousQuestionPrediction): added hideCP guard that replaces the mini-chart tile with a centered RevealCPButton on mobile
• Consumer binary left card (question_page_shell/index.tsx): wired hideCP → RevealCPButton and cpRevealsOn → UpcomingCP in the shell, removing the need for downstream components to handle these states
• Timeline hover cursor: suppressed the VictoryCursorContainer (replacing it with VictoryContainer) when hideCP or cpRevealsOn is active, so no hover line appears over a blank chart
• Histogram duplicate button: removed the RevealCPButton rendered inside the histogram view - it duplicated the one already shown in the left panel
• Title row overflow (title_row.tsx): fixed long or URL-heavy titles overflowing onto the CP status panel

Demo videos

Consumer view (desktop, mobile)

• Empty state

1.mp4

• Revealed on

2.mp4

• Hidden CP

3.mp4

• Other charts

4.mp4

Forecaster view (desktop, mobile)

• Empty state

5.mp4

• Revealed on

6.mp4

• Hidden CP

7.mp4

• Other charts

8.mp4

Consumer and Forecaster views (desktop, mobile)

• Empty state with Top key factors placeholder

9.mp4

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🚀 Preview Environment

Your preview environment is ready!

Resource	Details
🌐 Preview URL	https://metaculus-pr-4700-feat-empty-pre-cp-reveal-audit-preview.mtcl.cc
📦 Docker Image	ghcr.io/metaculus/metaculus:feat-empty-pre-cp-reveal-audit-for-the-new-side-by-side-row-ad9b7c1
🗄️ PostgreSQL	NeonDB branch preview/pr-4700-feat-empty-pre-cp-reveal-audit
⚡ Redis	Fly Redis mtc-redis-pr-4700-feat-empty-pre-cp-reveal-audit

Details

• Commit: ad9b7c12ca48ae45233259cb129d5aaf962e8f62
• Branch: feat/empty-pre-cp-reveal-audit-for-the-new-side-by-side-row
• Fly App: metaculus-pr-4700-feat-empty-pre-cp-reveal-audit

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