feat(desktop): Linux AppImage releases and desktop feature parity (#2398)

* feat(electron): add Linux AppImage releases

* ci: cache Linux OpenCode CLI artifacts

* fix(ci): await Linux release inventory check

* fix(electron): add frameless window controls on Linux desktop

Linux AppImages were created without native WM decorations and without
in-app controls, leaving users unable to close the window with a mouse.

Treat Linux like Windows: frameless BrowserWindow plus the existing
WindowsWindowControls header buttons and app-menu entry. macOS keeps
hidden title bar with traffic lights unchanged.

Shared usesFramelessElectronChrome() helper drives main window, mini
chat, header insets, and titlebar controls.

Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

* Linux desktop feature parity: Open in, background start, tray, multi-window (#2392)

* feat(electron): Linux parity for Open in, background start, and tray

Enable Linux desktop feature parity with macOS/Windows: open projects in
the default file manager and discovered apps, XDG autostart with
--background launches, system tray (including minimize-to-tray), and
tray sync from the renderer.

Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

* fix(electron): allow packaged UI protocol navigations on Linux

Prevent openchamber-ui:// navigations from being handed to
shell.openExternal, which fails on Linux and blocked desktop UI flows.

Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

* fix(ui): surface Linux tray settings in settings search

Include isLinux in settings search runtime context so minimize-to-tray
is discoverable on Linux desktop, matching Windows search behavior.

Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

* fix(electron): stop Linux AppImage Waiting-for-OpenCode flicker

Sync updated boot-outcome init scripts to all BrowserWindows after
desktop_hosts_set, and prefer state.initScript on dom-ready so chooser
reloads inject local/ok instead of a stale not-configured outcome.

Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

---------

Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

* fix(desktop): restore Linux AppImage updater feed and error UX (#2396)

Treat missing latest-linux*.yml (404) as no update available instead of a
hard failure, and stop swallowing updater capability/download errors in the
desktop bridge so About/sidebar can show actionable messages.

Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

* docs: credit Linux AppImage contributors in changelog

Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

---------

Co-authored-by: jibanez-staticduo <staticduo@gmail.com>
Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

packages/ui/src/lib/i18n/messages/ko.settings.ts

@@ -921,7 +921,7 @@ export const settingsDict = {
   'settings.openchamber.desktopNetwork.field.macMenuBarDescription': '앱을 다시 시작해야 합니다. 끄면 OpenChamber가 메뉴 막대 항목을 만들지 않으며 세션, 승인 및 사용량 업데이트도 실행하지 않습니다.',
   'settings.openchamber.desktopNetwork.field.minimizeToTrayAria': 'OpenChamber를 시스템 트레이로 최소화하거나 닫기',
   'settings.openchamber.desktopNetwork.field.minimizeToTray': '시스템 트레이로 최소화하고 닫기',
-  'settings.openchamber.desktopNetwork.field.minimizeToTrayDescription': '메인 창을 최소화하거나 닫아도 OpenChamber가 Windows 시스템 트레이에서 계속 실행됩니다.',
+  'settings.openchamber.desktopNetwork.field.minimizeToTrayDescription': '메인 창을 최소화하거나 닫아도 OpenChamber가 시스템 트레이에서 계속 실행됩니다.',
   'settings.openchamber.desktopNetwork.field.keepAwakeAria': 'OpenChamber가 실행되는 동안 컴퓨터 절전 방지',
   'settings.openchamber.desktopNetwork.field.keepAwake': 'OpenChamber가 실행되는 동안 컴퓨터 절전 방지',
   'settings.openchamber.desktopNetwork.field.keepAwakeDescription': '휴대폰이 이 앱을 계속 열 수 있도록 합니다. 디스플레이는 꺼질 수 있습니다.',