Merge pull request #461 from poppingmoon/timeline-unfocus

入力欄以外をタップしたときにフォーカスを外す

lib/view/time_line_page/timeline_note.dart

@@ -33,6 +33,7 @@ class TimelineNoteFieldState extends ConsumerState<TimelineNoteField> {
         maxLines: null,
         controller: ref.watch(timelineNoteProvider),
         decoration: noteStyle,
+        onTapOutside: (_) => FocusManager.instance.primaryFocus?.unfocus(),
       ),
     );
   }