fix(reader): pin foliate-js e448d36 — webtoon pages now load

The initial webtoon commit's IntersectionObserver (shadow-host root)
never delivered intersections in Chromium, leaving pages blank.
Scroll-driven loading in e448d36 fixes it; verified end-to-end in a
real browser: pages render (content-rich screenshots), deep scroll
advances the reading position (7/10) and progress readout, filters
visibly change both webtoon images and PDF pages via ::part(filter)
(brightness 5% -> 57% smaller screenshot), paged comics still use
foliate-fxl, and webtoon UI gating (zoom/spread hidden) works.

package.json

@@ -12,7 +12,7 @@
     "dev": "npm run build:ts:dev && npm run build:css"
   },
   "dependencies": {
-    "@bookhoard/foliate-js": "git+https://github.com/john-okeefe/foliate-js.git#ea268df",
+    "@bookhoard/foliate-js": "git+https://github.com/john-okeefe/foliate-js.git#e448d36",
     "alpinejs": "^3.15.8",
     "chart.js": "^4.5.1",
     "highlight.js": "^11.11.1",