gui: raise empty-state shortcut hint contrast

The Shift+Ctrl+N hint under empty-state CTAs used alpha 0.65 at 0.82em,
which reads too faint on Adwaita light surfaces. Match other secondary
labels at alpha 0.78 so the accelerator stays quiet but legible.

Opened by TtyPolish
0e46e743a1Lucenx9 committed on 10/16/2026, 8:29:41 AMparentc03dc98

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