chore(deps): bump dioxus 0.7.4→0.7.6 and ecosystem crates

glib remains 0.18.5 — entire tray-icon/gtk/libappindicator/dioxus-desktop
chain still pins gtk ^0.18; no upstream fix available. Dismissed MEDIUM
alert: no fix path until dioxus 0.8+ or tray-icon migrates to gtk 0.20.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: hyperpolymath