#171 Epic: Linux integration push

[Anonymous]

Originally created by: kristofferR

Tracking issue for a set of Linux-native features. Linux already has solid foundations (KSNI tray, portal theme-following, Wayland renderer workaround, AUR updates); this epic closes the remaining gaps. Each sub-issue is independently shippable, in rough priority order:

• [ ] [#166] — Wayland-safe global shortcut via the XDG GlobalShortcuts portal (fixes a real defect; step toward [#52])
• [ ] [#167] — Notification action buttons, KDE inline quick-reply, and sound hint (Linux counterpart to [#86])
• [ ] [#168] — Visible unread count: tray badge pixmap, NeedsAttention, Unity LauncherEntry
• [ ] [#169] — Symbolic tray icon option (depends on [#168]'s tray work)
• [ ] [#170] — Desktop actions, CLI flags, and AppStream metainfo (metainfo is a Flathub prerequisite)
• [ ] [#150] — Flathub/Flatpak spike (existing issue; the manifest should build from source against the GNOME runtime, gate the updater and autostart off in the sandbox, and needs [#170]'s metainfo)

Suggested order: [#166] → [#167] → [#168] → [#169] → [#170] → [#150]. Design details live in each sub-issue.

[Anonymous]

Ticket changed by: kristofferR

• status: open --> closed

[Anonymous]

Originally posted by: kristofferR

Completed in merged PR [#195]. The work was delivered in the requested order across [#166], [#167], [#168], [#169], [#170], and [#150]: portal global shortcuts, Linux notification replies, unread indicators, symbolic tray support, desktop and AppStream integration, and the Flatpak spike. All linked implementation issues are now closed.