feat(folder-browser): keyboard nav, context menus, now-playing path UX

Adds full keyboard navigation (arrow keys, Enter, Ctrl+Enter for context menu) across Folder Browser columns. Context menus for all row types with keyboard-operable submenus and star-rating control via arrow keys + Enter. Now-playing path is visually emphasized and stays stable; rebuilds on hotkey re-invoke or active-path follow-along. Adaptive column layout for deep trees with right-side visibility priority. New configurable 'Open Folder Browser' keybinding. StarRating animation sync for keyboard-driven changes. All 7 locales updated.

src/locales/de.ts

@@ -562,6 +562,7 @@ export const deTranslation = {
     shortcutSeekForward: '10s vorspulen',
     shortcutSeekBackward: '10s zurückspulen',
     shortcutToggleQueue: 'Warteschlange ein-/ausblenden',
+    shortcutOpenFolderBrowser: '{{folderBrowser}} öffnen',
     shortcutFullscreenPlayer: 'Vollbild-Player',
     shortcutNativeFullscreen: 'Nativer Vollbildmodus',
     tabSystem: 'System',

src/locales/en.ts

@@ -587,6 +587,7 @@ export const enTranslation = {
     shortcutSeekForward: 'Seek forward 10s',
     shortcutSeekBackward: 'Seek backward 10s',
     shortcutToggleQueue: 'Toggle queue',
+    shortcutOpenFolderBrowser: 'Open {{folderBrowser}}',
     shortcutFullscreenPlayer: 'Fullscreen player',
     shortcutNativeFullscreen: 'Native fullscreen',
     playbackTitle: 'Playback',

src/locales/fr.ts

@@ -560,6 +560,7 @@ export const frTranslation = {
     shortcutSeekForward: 'Avancer de 10s',
     shortcutSeekBackward: 'Reculer de 10s',
     shortcutToggleQueue: 'Afficher/masquer la file',
+    shortcutOpenFolderBrowser: 'Ouvrir {{folderBrowser}}',
     shortcutFullscreenPlayer: 'Lecteur plein écran',
     shortcutNativeFullscreen: 'Plein écran natif',
     tabSystem: 'Système',

src/locales/nb.ts

@@ -582,6 +582,7 @@ export const nbTranslation = {
     shortcutSeekForward: 'Søk fremover 10 sekunder',
     shortcutSeekBackward: 'Søk bakover 10 sekunder',
     shortcutToggleQueue: 'Veksle kø',
+    shortcutOpenFolderBrowser: 'Åpne {{folderBrowser}}',
     shortcutFullscreenPlayer: 'Fullskjermsspiller',
     shortcutNativeFullscreen: 'Naturlig fullskjerm',
     playbackTitle: 'Avspilling',

src/locales/nl.ts

@@ -560,6 +560,7 @@ export const nlTranslation = {
     shortcutSeekForward: '10s vooruitspoelen',
     shortcutSeekBackward: '10s terugspoelen',
     shortcutToggleQueue: 'Wachtrij tonen/verbergen',
+    shortcutOpenFolderBrowser: '{{folderBrowser}} openen',
     shortcutFullscreenPlayer: 'Volledigschermspeler',
     shortcutNativeFullscreen: 'Systeemvolledig scherm',
     tabSystem: 'Systeem',

src/locales/ru.ts

@@ -611,6 +611,7 @@ export const ruTranslation = {
     shortcutSeekForward: 'Вперёд на 10 с',
     shortcutSeekBackward: 'Назад на 10 с',
     shortcutToggleQueue: 'Показать / скрыть очередь',
+    shortcutOpenFolderBrowser: 'Открыть {{folderBrowser}}',
     shortcutFullscreenPlayer: 'Полноэкранный плеер',
     shortcutNativeFullscreen: 'Системный полный экран',
     playbackTitle: 'Воспроизведение',

src/locales/zh.ts

@@ -579,6 +579,7 @@ export const zhTranslation = {
     shortcutSeekForward: '快进 10 秒',
     shortcutSeekBackward: '快退 10 秒',
     shortcutToggleQueue: '切换队列',
+    shortcutOpenFolderBrowser: '打开{{folderBrowser}}',
     shortcutFullscreenPlayer: '全屏播放器',
     shortcutNativeFullscreen: '原生全屏',
     playbackTitle: '播放',