fix: page through all chapters when the API omits total

listAllChapters used `page.total ?? all.length` as the loop bound. The
/chapters endpoint always returns `total: null`, so a full 200-row first
page broke the loop immediately — the reader dead-ended past chapter 200.
Stop on a short page instead; only trust `total` when actually reported.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "mangalord-frontend",
-  "version": "0.128.3",
+  "version": "0.128.4",
   "private": true,
   "type": "module",
   "scripts": {