feat(overlay): add subtitle selection modal and Jellyfin 12 fixes

- Add an optional subtitle selection modal for primary/secondary mpv tracks (subtitleSelection.enabled, g-s sequence shortcut) with key-sequence conflict handling
- Authenticate Jellyfin URLs with the ApiKey query, answer remote keep-alives, clear now-playing on stop, and restore episode titles in Anki misc info
- Honor the configured mpv executable when Jellyfin starts playback via a shared mpv-process launcher
- Bump electron-builder to 26.16.1
- Condense and reconcile changelog fragments; update config example and docs

src/types/config.ts

@@ -126,6 +126,7 @@ export interface ShortcutsConfig {
   openRuntimeOptions?: string | null;
   openJimaku?: string | null;
   openTsukihime?: string | null;
+  openSubtitleSelection?: string | null;
   openSubtitleGeneration?: string | null;
   openSessionHelp?: string | null;
   openControllerSelect?: string | null;
@@ -156,6 +157,7 @@ export interface Config {
   shortcuts?: RawShortcutsConfig;
   secondarySub?: SecondarySubConfig;
   subsync?: SubsyncConfig;
+  subtitleSelection?: { enabled?: boolean };
   subtitleGeneration?: Partial<SubtitleGenerationConfig>;
   startupWarmups?: StartupWarmupsConfig;
   subtitleStyle?: SubtitleStyleConfig;
@@ -310,6 +312,7 @@ export interface ResolvedConfig {
   shortcuts: Required<ShortcutsConfig>;
   secondarySub: Required<SecondarySubConfig>;
   subsync: Required<SubsyncConfig>;
+  subtitleSelection: { enabled: boolean };
   subtitleGeneration: SubtitleGenerationConfig;
   startupWarmups: {
     lowPowerMode: boolean;

src/types/runtime.ts

@@ -525,6 +525,13 @@ export interface ElectronAPI {
   focusMainWindow: () => Promise<void>;
   activatePlaybackWindowForOverlayInteraction: () => Promise<boolean>;
   getSubtitleStyle: () => Promise<SubtitleRendererStyleConfig | null>;
+  onSubtitleSelectionOpen: (callback: () => void) => void;
+  getSubtitleSelection: () => Promise<
+    import('../shared/subtitle-selection').SubtitleSelectionState
+  >;
+  applySubtitleSelection: (
+    request: import('../shared/subtitle-selection').SubtitleSelectionRequest,
+  ) => Promise<void>;
   onSubsyncManualOpen: (callback: (payload: SubsyncManualPayload) => void) => void;
   runSubsyncManual: (request: SubsyncManualRunRequest) => Promise<SubsyncResult>;
   onKikuFieldGroupingRequest: (callback: (data: KikuFieldGroupingRequestData) => void) => void;
@@ -604,6 +611,7 @@ export interface ElectronAPI {
     modal:
       | 'runtime-options'
       | 'subsync'
+      | 'subtitle-selection'
       | 'subtitle-generation'
       | 'jimaku'
       | 'tsukihime'
@@ -622,6 +630,7 @@ export interface ElectronAPI {
     modal:
       | 'runtime-options'
       | 'subsync'
+      | 'subtitle-selection'
       | 'subtitle-generation'
       | 'jimaku'
       | 'tsukihime'
@@ -637,6 +646,7 @@ export interface ElectronAPI {
       | 'changelog',
   ) => void;
   reportOverlayContentBounds: (measurement: OverlayContentMeasurement) => void;
+  onSessionBindingsChanged: (callback: (bindings: CompiledSessionBinding[]) => void) => void;
   onConfigHotReload: (callback: (payload: ConfigHotReloadPayload) => void) => void;
 }
 

src/types/session-bindings.ts

@@ -23,6 +23,7 @@ export type SessionActionId =
   | 'openControllerDebug'
   | 'openJimaku'
   | 'openTsukihime'
+  | 'openSubtitleSelection'
   | 'openSubtitleGeneration'
   | 'openYoutubePicker'
   | 'openPlaylistBrowser'