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-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "rc-racecore",
-  "version": "1.36.0",
+  "version": "1.36.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "rc-racecore",
-      "version": "1.36.0",
+      "version": "1.36.1",
       "hasInstallScript": true,
       "dependencies": {
         "better-sqlite3": "^12.11.1",