feat: add course bar length setting and clear blue glass Dock

mobile/lib/domain/app_snapshot.dart

@@ -62,6 +62,7 @@ class AppSnapshot {
       'singleColorArgb': settings.singleColorArgb,
       'calendarEnabled': settings.calendarEnabled,
       'calendarId': settings.calendarId,
+      'courseHeightScale': settings.courseHeightScale,
     },
     'importMetadata': importMetadata == null
         ? null
@@ -90,6 +91,15 @@ class AppSnapshot {
       }
       final color = s['singleColorArgb'] as int;
       if (color < 0 || color > 0xFFFFFFFF) throw const FormatException('颜色无效');
+      final rawHeight = s.containsKey('courseHeightScale')
+          ? s['courseHeightScale']
+          : AppSettings.defaultCourseHeightScale;
+      if (rawHeight is! num ||
+          !rawHeight.isFinite ||
+          rawHeight < AppSettings.minCourseHeightScale ||
+          rawHeight > AppSettings.maxCourseHeightScale) {
+        throw const FormatException('课程条长度无效');
+      }
       final sem = s['semester'];
       final term = sem == null
           ? null
@@ -110,6 +120,7 @@ class AppSnapshot {
           singleColorArgb: color,
           calendarEnabled: s['calendarEnabled'] as bool,
           calendarId: s['calendarId'] as String?,
+          courseHeightScale: rawHeight.toDouble(),
         ),
         importMetadata: metadata == null
             ? null