feat: Add smart AGS/Quickshell fallback with OverviewToggle wrapper

Implements a robust fallback mechanism for desktop overview functionality
that handles both AGS and Quickshell installations gracefully.

Changes:
- Add OverviewToggle.sh wrapper script that tries Quickshell first,
  falls back to AGS if unavailable or broken
- Update UserKeybinds.conf with new SUPER+A binding to OverviewToggle.sh
- Preserve original AGS and Quickshell keybinds as commented references
- Simplify copy.sh logic to enable both AGS and QS simultaneously
- Remove conflicting keybind toggle logic from copy.sh

Benefits:
- Users can have both AGS and Quickshell installed simultaneously
- Automatic fallback when one tool is broken or unavailable
- Quickshell preferred (tried first) as it's more performant
- Graceful degradation with user notification if neither available
- Auto-starts AGS if installed but not running
- Compatible with existing upgrade.sh and ComposeHyprConfigs.sh workflow

Technical details:
- OverviewToggle.sh checks for running processes before attempting toggle
- Uses hyprctl dispatch for Quickshell's global dispatcher
- Falls back to ags -t 'overview' with rofi cleanup for AGS
- Shows desktop notification if neither tool is available
- Script auto-made executable via existing chmod in copy.sh (line 1027)

Addresses: Issue where AGS and Quickshell have had recent stability
           problems, requiring manual keybind switching between them

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