🖱️ Click-Based Interaction & UI Enhancements

Refining the user experience with intuitive click controls, responsive panels, and pixel-perfect resizing.

🎯 What We Built

1. ✅ Click-Based Add Controls – Add sections before/after with a single click.
2. ✅ Collapsible Panels – Panels now use stateful open/collapsed/hidden behavior.
3. ✅ Style Synchronization – Config panel edits immediately reflect on canvas.
4. ✅ Click-Based Resize Mode – Flex sections resize via plus/minus actions (no dragging).
5. ✅ 3-State Persistent Panels – Sidebar & config panel remember state via flash persistence.

✨ Highlights

1. Click-Based Add Controls

• Add mode now surfaces arrow buttons on each section.
• Up arrow → adds a new section before. Down arrow → adds after.
• Instant feedback with neon indicators + tooltips.

2. Collapsible Panels (3-State)

• Panels follow the Open → Collapsed → Hidden cycle from README-3-STATE-PERSISTENT-NAVIGATION.
• Each panel has:
  • Cycle button with dynamic icon + state dots.
  • Floating restore button when hidden.
  • Smooth width transitions (320px → 64px → 0px).
• State is saved using storage-system (flash persistence + MongoDB real-time sync).

3. Style Synchronization

• getSectionStyles() now applies:
  • grid-row, grid-column spans
  • flex-grow, flex-basis, order, align-self
  • Width/height + min/max constraints
• Changing values in the config panel updates the canvas instantly.

4. Click-Based Resize Mode

• Resize mode shows + / - pills on flex sections.
• Each click adjusts flexGrow (range: 1 → 12), giving precise relative sizing.
• Grid edit handles now use clicks (no drag) to expand cells right/down/diagonally.

5. Canvas-First Experience

• Config panel is automatically hidden when no section is selected.
• A subtle on-canvas hint (“Click a section to configure it”) keeps the UI clean.
• Sidebar + config panel states persist across sessions and tabs (flash persistence).

🧠 Storage & Real-Time Sync

• Panel states stored under modular-universe/ui-state/<universeId>/<moduleType>.
• Uses GgStorage flash persistence with storage events → instant cross-tab sync.
• Avoids layout thrash by debouncing saves (200ms) and guarding against loops.

🧪 Testing Checklist

• Toggle sidebar through Open → Collapsed → Hidden → Open.
• Hide config panel, select a section → panel reopens to last state.
• Resize a flex section via + / - buttons (observe flexGrow label change).
• Grid layout: use Grid Edit handles (single click) to expand spans.
• Refresh page → panel states restored instantly.

Result: A modern, click-first experience that maximizes canvas space, keeps every state in sync, and feels fantastic on both desktop and mobile. 🚀