feat(glossary): add episode groups, search, and import/export

Apply glossary edits directly to translated subtitles and reload the active track. Keep terms with their originating episode, preserve existing translations, and clear stale episode groups with glossary entries.

src/qml/Main.qml

@@ -20,6 +20,11 @@ ApplicationWindow {
 
     property int previousVisibility: Window.Windowed
     readonly property bool isFullScreen: visibility === Window.FullScreen
+    // Keep the original subtitle track so glossary edits update the generated
+    // subtitle even while that translated track is selected in mpv.
+    property var lastTranslationTrack: null
+    property url lastTranslationVideo: ""
+    property var translatedSubtitleUrls: []
 
     function openFile(url: url) {
         playlistModel.openFile(url, QtPotatoSettings.playlistLoadSiblings)
@@ -42,8 +47,13 @@ ApplicationWindow {
     }
 
     function translateCurrentSubtitle() {
-        const track = video.subtitleTracks.find(track => track.id === video.subtitleId)
+        let track = video.subtitleTracks.find(track => track.id === video.subtitleId)
+        if (track && translatedSubtitleUrls.includes(track.externalFilename) && lastTranslationTrack) {
+            track = video.subtitleTracks.find(track => track.id === lastTranslationTrack.id)
+        }
         if (track) {
+            lastTranslationTrack = track
+            lastTranslationVideo = video.currentUrl
             translationService.translate(video.currentUrl, track, video.mediaTitle)
         }
     }
@@ -154,6 +164,8 @@ ApplicationWindow {
     TranslationService {
         id: translationService
         onTranslated: (subtitleUrl, fromCache) => {
+            // mpv exposes local external subtitle filenames as filesystem paths.
+            appWindow.translatedSubtitleUrls.push(decodeURIComponent(subtitleUrl.toString().replace(/^file:\/\//, "")))
             video.showTranslatedSubtitleFile(subtitleUrl,
                 KI18n.i18nc("@item:inlistbox subtitle track, %1 is a language", "%1 (translated)", QtPotatoSettings.targetLanguage))
             osdItem.message(fromCache
@@ -165,6 +177,15 @@ ApplicationWindow {
     MpvVideo {
         id: video
 
+        onCurrentUrlChanged: {
+            translationService.cancel()
+            translationService.forgetTranslation()
+            appWindow.lastTranslationTrack = null
+            appWindow.lastTranslationVideo = ""
+            appWindow.translatedSubtitleUrls = []
+            glossaryDialog.close()
+        }
+
         actions: appActions
         fullscreen: appWindow.isFullScreen
 
@@ -208,9 +229,6 @@ ApplicationWindow {
             }
         }
 
-        // A translation belongs to the file it was started for.
-        onCurrentUrlChanged: translationService.cancel()
-
         Osd {
             id: osdItem
             maxWidth: video.width