[Enhancement] Figma-style sections

[youssefvdel]

Figma-Style Sections as Workspaces

Overview

Transform sections from canvas decorations into workspace-like containers that are created dynamically at runtime (not via config).
Key difference from config-based: Sections are runtime entities created via right-click menu or keyboard shortcut, stored in memory/state file only.

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Context Menu Flow

Right-Click on Canvas

┌─────────────────┐
│ New Section     │ ← Creates section at viewport, switches to it
└─────────────────┘

Right-Click on Active Section

┌─────────────────┐
│ New Section     │
├─────────────────┤
│ Suspend         │ ← Suspends all apps in section (frees RAM/CPU)
│ Rename          │
│ Delete          │
└─────────────────┘

Right-Click on Inactive Section

┌─────────────────┐
│ New Section     │
├─────────────────┤
│ Active          │ ← resume from suspended
│ Rename          │
│ Delete          │
└─────────────────┘

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Suspend:

• Get all windows in active section
• Get their PIDs (from window/app_id mapping)
• Send SIGSTOP to each PID
• Mark section as suspended
• turn into gray

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Future

1. Drag windows between sections — drag to edge, peek into adjacent section
2. Per-section backgrounds — different wallpaper per section (color picker)
3. Section locking — prevent moving section instead of window
4. Move window to section — context menu on window → "Move to Section X"