实现pdf中划句子ai伴读的功能，修复pdf高亮显示的问题

typings/i10n.d.ts

@@ -49,6 +49,8 @@ export type FluentMessageId =
   | 'lecture-beat-tts-pending'
   | 'lecture-empty-desc'
   | 'lecture-empty-title'
+  | 'lecture-explain-selection'
+  | 'lecture-explain-selection-short'
   | 'lecture-granularity-paragraph'
   | 'lecture-granularity-sentence'
   | 'lecture-loading'
@@ -76,6 +78,14 @@ export type FluentMessageId =
   | 'lecture-playing-zh'
   | 'lecture-reprepare'
   | 'lecture-save-note'
+  | 'lecture-selection-context'
+  | 'lecture-selection-done'
+  | 'lecture-selection-empty'
+  | 'lecture-selection-explaining'
+  | 'lecture-selection-no-item'
+  | 'lecture-selection-replay'
+  | 'lecture-selection-syntax'
+  | 'lecture-selection-title'
   | 'lecture-sentence-label'
   | 'lecture-sentence-list-hint'
   | 'lecture-sentence-list-title'