feat: make the Kvantum theme translucent and blurred

Qt windows were opaque while the rest of the desktop was not. This turns on
translucent_windows and blurring and lifts reduce_window_opacity from 10 to 15.

The keys are global rather than per-scheme placeholders on purpose: every
scheme wants the same frame treatment, and making it a role would add three
keys to all ten role files to encode a value none of them would disagree
about. All ten schemes gain the effect.

Worth knowing when this looks wrong: Kvantum only makes the window
see-through. The blur behind it is the compositor's, so under a Hyprland
without a blur rule covering Qt surfaces these settings read as plain
transparency rather than the intended glass.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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