imi: niri support, autohide, dynamic workspaces

[dodo986]

Route workspace, window and fullscreen state through the shell's compositor-neutral Wm facade with direct niri msg fallbacks where the daemon path is dark, so the bar runs on Hyprland and niri.

• Scene.qml honors bar.autoHide (hover strip, Super peek, popup and edit-mode holds, dedicated zone reserver) with an Autohide switch in the edit-mode widget picker
• WorkspaceModel/Workspaces follow the live set on scrolling models and keep fixed slots elsewhere
• Drop Hyprland-only registry gate, bump to 1.1.0

What is this?

niri support and autohide features for the imi bar

Checklist

• [✓ ] One folder under its catalogue with a manifest and a real preview image (not a placeholder).
• [ ✓] One entry added to that catalogue's registry.json (lastUpdated in YYYY-MM-DD; official: false for community items).
• [ ✓] Tested live in Ryoku, it renders and behaves correctly (see DEVELOP.md).
• [✓ ] tests/validate-catalogue.sh passes from the repo root.
• [✓ ] I own or have permission to submit this content, and it is licensed for redistribution.
• [ ✓] It does not overwrite user configuration or run privileged commands without clear consent.