Add floating bar glass layer rule

[gitcoder89431]

Refs #78.

What changed

• Makes Surface Material = Glass enable a real Hyprland blur layer rule for the floating omarchy-bar surface.
• Keeps the rule gated off when the bar is docked so notch/frame/docked chrome stay solid for a later coupled-surface pass.
• Reloads Hyprland when Surface Material changes, so compositor layer rules update immediately.
• Tunes floating glass fill to 0.68, matching the launcher glass baseline more closely.
• Extends the Umbrella: unify Ruixen bar surfaces before the Bar.qml refactor #78 surface contract so all lookfeel variants agree on the floating-only glass rule and notch/frame remain untouched.

QA

• Live-tested on floating bar with material: glass; visual pass approved.
• tests/bar-surface-contract.sh
• tests/glass-profile-contract.sh
• tests/bar-popup-clearance.sh
• omarchy plugin validate bars/v2/ruixen.bar
• omarchy plugin validate ruixen.launcher
• omarchy plugin validate bars/widgets/ruixen.notch
• tests/run-all.sh