fix(series): clearer step layout, sorted class list and autosave

The series page is split into numbered steps; classes are a sorted list
with the tick on the left and All/None, new series start with none, and
every change is saved straight away so ticks are no longer lost. Also
gives primary/danger buttons white text in the light theme.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "rc-racecore",
-  "version": "1.36.0",
+  "version": "1.36.1",
   "private": true,
   "description": "RC RaceCore live timing and race control with AMMC ingest and SQLite persistence",
   "engines": {