feat(updater): professional update modal with skip, changelog, and OS-aware downloader

Replaces the small corner toast with a centered modal that appears on
startup when a newer GitHub release is detected (4 s delay).

Features:
- Skip this Version: stores skipped tag in localStorage, reappears only
  for newer releases
- Collapsible changelog: renders GitHub release body as markdown accordion
- OS-aware download: Windows → .exe installer, macOS → .dmg (aarch64
  preferred), Linux Arch → AUR hint (yay/pacman), Linux other → .AppImage/.deb
- In-app downloader: Rust download_update command streams to ~/Downloads/,
  emits update:download:progress every 250 ms for a real-time progress bar
- Post-download: Show in Folder button opens Downloads dir via shell.open
- Buttons: Download Now / Skip this Version / Remind me Later

Rust: check_arch_linux() reads /etc/arch-release + /etc/os-release
platform.ts: adds IS_MACOS, IS_WINDOWS alongside existing IS_LINUX
Settings About: Preview Update Modal button for testing
Fixes: renderInline regex had nested capture group causing undefined entries
in split() result → TypeError → React crash → WebKit white-screen freeze

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

src/locales/de.ts

@@ -350,6 +350,18 @@ export const deTranslation = {
     updaterAvailable: 'Update verfügbar',
     updaterVersion: 'v{{version}} verfügbar',
     updaterWebsite: 'Website',
+    updaterModalTitle: 'Neue Version verfügbar',
+    updaterChangelog: 'Was ist neu',
+    updaterDownloadBtn: 'Jetzt herunterladen',
+    updaterSkipBtn: 'Version überspringen',
+    updaterRemindBtn: 'Später erinnern',
+    updaterDone: 'Download abgeschlossen',
+    updaterShowFolder: 'Im Ordner anzeigen',
+    updaterInstallHint: 'Psysonic schließen und das Installationsprogramm manuell ausführen.',
+    updaterAurHint: 'Update über AUR installieren:',
+    updaterErrorMsg: 'Download fehlgeschlagen',
+    updaterRetryBtn: 'Erneut versuchen',
+    updaterOpenGitHub: 'Auf GitHub öffnen',
   },
   settings: {
     title: 'Einstellungen',

src/locales/en.ts

@@ -351,6 +351,18 @@ export const enTranslation = {
     updaterAvailable: 'Update available',
     updaterVersion: 'v{{version}} is available',
     updaterWebsite: 'Website',
+    updaterModalTitle: 'New Version Available',
+    updaterChangelog: "What's New",
+    updaterDownloadBtn: 'Download Now',
+    updaterSkipBtn: 'Skip this Version',
+    updaterRemindBtn: 'Remind me Later',
+    updaterDone: 'Download complete',
+    updaterShowFolder: 'Show in Folder',
+    updaterInstallHint: 'Close Psysonic and run the installer manually.',
+    updaterAurHint: 'Install the update via AUR:',
+    updaterErrorMsg: 'Download failed',
+    updaterRetryBtn: 'Retry',
+    updaterOpenGitHub: 'Open on GitHub',
   },
   settings: {
     title: 'Settings',
@@ -479,6 +491,7 @@ export const enTranslation = {
     aboutLicense: 'License',
     aboutLicenseText: 'GNU GPL v3 — free to use, modify, and distribute under the same license.',
     aboutRepo: 'Source Code on GitHub',
+    aboutPreviewUpdate: 'Preview Update Modal',
     aboutVersion: 'Version',
     aboutBuiltWith: 'Built with Tauri · React · TypeScript · Rust/rodio',
     aboutAiCredit: 'Developed with the support of Claude Code by Anthropic',

src/locales/fr.ts

@@ -350,6 +350,18 @@ export const frTranslation = {
     updaterAvailable: 'Mise à jour disponible',
     updaterVersion: 'v{{version}} est disponible',
     updaterWebsite: 'Site Web',
+    updaterModalTitle: 'Nouvelle version disponible',
+    updaterChangelog: 'Nouveautés',
+    updaterDownloadBtn: 'Télécharger maintenant',
+    updaterSkipBtn: 'Ignorer cette version',
+    updaterRemindBtn: 'Me rappeler plus tard',
+    updaterDone: 'Téléchargement terminé',
+    updaterShowFolder: 'Afficher dans le dossier',
+    updaterInstallHint: 'Fermez Psysonic et lancez le programme d\'installation manuellement.',
+    updaterAurHint: 'Installer la mise à jour via AUR :',
+    updaterErrorMsg: 'Échec du téléchargement',
+    updaterRetryBtn: 'Réessayer',
+    updaterOpenGitHub: 'Ouvrir sur GitHub',
   },
   settings: {
     title: 'Paramètres',

src/locales/nb.ts

@@ -350,6 +350,18 @@ export const nbTranslation = {
     updaterAvailable: 'Ny versjon er tilgjengelig',
     updaterVersion: 'v{{version}} er tilgjengelig',
     updaterWebsite: 'Nettsted',
+    updaterModalTitle: 'Ny versjon tilgjengelig',
+    updaterChangelog: 'Hva er nytt',
+    updaterDownloadBtn: 'Last ned nå',
+    updaterSkipBtn: 'Hopp over denne versjonen',
+    updaterRemindBtn: 'Påminn meg senere',
+    updaterDone: 'Nedlasting fullført',
+    updaterShowFolder: 'Vis i mappe',
+    updaterInstallHint: 'Lukk Psysonic og kjør installasjonsprogrammet manuelt.',
+    updaterAurHint: 'Installer oppdateringen via AUR:',
+    updaterErrorMsg: 'Nedlasting mislyktes',
+    updaterRetryBtn: 'Prøv igjen',
+    updaterOpenGitHub: 'Åpne på GitHub',
   },
   settings: {
     title: 'Innstillinger',

src/locales/nl.ts

@@ -350,6 +350,18 @@ export const nlTranslation = {
     updaterAvailable: 'Update beschikbaar',
     updaterVersion: 'v{{version}} beschikbaar',
     updaterWebsite: 'Website',
+    updaterModalTitle: 'Nieuwe versie beschikbaar',
+    updaterChangelog: 'Wat is er nieuw',
+    updaterDownloadBtn: 'Nu downloaden',
+    updaterSkipBtn: 'Deze versie overslaan',
+    updaterRemindBtn: 'Later herinneren',
+    updaterDone: 'Download voltooid',
+    updaterShowFolder: 'Tonen in map',
+    updaterInstallHint: 'Sluit Psysonic en voer het installatieprogramma handmatig uit.',
+    updaterAurHint: 'Update installeren via AUR:',
+    updaterErrorMsg: 'Downloaden mislukt',
+    updaterRetryBtn: 'Opnieuw proberen',
+    updaterOpenGitHub: 'Openen op GitHub',
   },
   settings: {
     title: 'Instellingen',

src/locales/ru.ts

@@ -364,6 +364,18 @@ export const ruTranslation = {
     updaterAvailable: 'Доступно обновление',
     updaterVersion: 'Версия {{version}} доступна',
     updaterWebsite: 'Сайт',
+    updaterModalTitle: 'Доступна новая версия',
+    updaterChangelog: 'Что нового',
+    updaterDownloadBtn: 'Скачать сейчас',
+    updaterSkipBtn: 'Пропустить эту версию',
+    updaterRemindBtn: 'Напомнить позже',
+    updaterDone: 'Загрузка завершена',
+    updaterShowFolder: 'Показать в папке',
+    updaterInstallHint: 'Закройте Psysonic и запустите установщик вручную.',
+    updaterAurHint: 'Установить обновление через AUR:',
+    updaterErrorMsg: 'Ошибка загрузки',
+    updaterRetryBtn: 'Повторить',
+    updaterOpenGitHub: 'Открыть на GitHub',
   },
   settings: {
     title: 'Настройки',

src/locales/zh.ts

@@ -346,6 +346,18 @@ export const zhTranslation = {
     updaterAvailable: '有可用更新',
     updaterVersion: 'v{{version}} 已发布',
     updaterWebsite: '官网',
+    updaterModalTitle: '有新版本可用',
+    updaterChangelog: '更新内容',
+    updaterDownloadBtn: '立即下载',
+    updaterSkipBtn: '跳过此版本',
+    updaterRemindBtn: '稍后提醒',
+    updaterDone: '下载完成',
+    updaterShowFolder: '在文件夹中显示',
+    updaterInstallHint: '请关闭 Psysonic 并手动运行安装程序。',
+    updaterAurHint: '通过 AUR 安装更新：',
+    updaterErrorMsg: '下载失败',
+    updaterRetryBtn: '重试',
+    updaterOpenGitHub: '在 GitHub 上打开',
   },
   settings: {
     title: '设置',