Add toggle to hide reviews bottom bar in recap screens

[Copilot]

What

Adds collapsible bottom bar in proposals/grants recap screens. Users reviewing submissions often need more screen space; the fixed statistics bar consumes ~100px at bottom.

Implementation:

• Circular toggle button (bottom-right, z-index 501) with ▼/▲ indicator
• CSS transform animation (translateY(100%) when hidden, 0.3s ease-in-out)
• Button repositions itself: bottom: 100px when bar visible, 10px when hidden
• localStorage persistence with page-specific keys (proposalsBottomBarHidden, grantsBottomBarHidden)
• Full ARIA support (aria-label, aria-expanded dynamic updates, aria-hidden on icon)
• Null-safe initialization (checks element existence, console.warn on missing DOM)

Affected templates:

• backend/reviews/templates/proposals-recap.html - always shows toggle
• backend/reviews/templates/grants-recap.html - toggle rendered inside permission block

Technical details:

• Event listener consolidated into existing window.addEventListener('load') handlers (no duplicates)
• Button uses sibling combinator (~) for conditional positioning CSS
• Graceful degradation if localStorage unavailable

ToDo

• Implement toggle functionality
• Add accessibility attributes
• Consolidate event listeners
• Add null checks
• Fix permission-based rendering

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Project	Deployment	Review	Updated (UTC)
pycon	Ready	Preview	Jan 28, 2026 4:58pm