perf: reduce library pages on low memory devices

CHANGELOG.md

@@ -57,6 +57,8 @@ Follows [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) · versioned wi
   preventing repeated clicks from issuing duplicate LLM casting requests.
 - **Image Job Cancellation.** Consistent profile/reference jobs now expose a cooperative cancellation endpoint and
   progress-panel Cancel control; queued work can be cancelled without interrupting unrelated ComfyUI jobs.
+- **Low-Memory Table Mode.** Character and voice-library pages now render 25 rows at a time on devices reporting
+  approximately 4 GB RAM or less, while images remain lazy-loaded.
 - **Preview Blob Lifecycle.** Character-library and Rehearser local voice previews now revoke replaced or completed
   object URLs, reducing retained browser memory during repeated auditioning.
 - **Character Library Smoke Coverage.** Added deterministic browser coverage for opening Characters / Cast, profile

TODO.md

@@ -115,7 +115,8 @@ the first block before investing in architecture or polish.
 - [x] Revoke discarded object URLs with `URL.revokeObjectURL(objectUrl)`; completed synthesized voice previews and
   character/Rehearser local auditions now release their Blob URLs when playback ends or is replaced.
 - [x] Add low-memory mode using `navigator.deviceMemory` where available; shared worker pools cap at two tasks on devices reporting approximately 4 GB RAM or less.
-- [ ] Disable image preloading and reduce table/cache sizes on devices with approximately 4 GB RAM.
+- [x] Disable image preloading and reduce table/cache sizes on devices with approximately 4 GB RAM. Images use
+  lazy decoding, and character/voice pages reduce from 50 to 25 rows when `navigator.deviceMemory <= 4`.
 
 ## P1 — Backend stability and bounded concurrency
 

static/js/library-characters.js

@@ -186,7 +186,7 @@ async function libraryRenderCharacters() {
     // memory for sorting, relationship lookups and bulk operations, while
     // only one 50-row page is put into the DOM at a time.
     const pageKey = 'ttsvc_libchars_page::' + book;
-    const pageSize = 50;
+    const pageSize = typeof window.ttvcIsLowMemoryDevice === 'function' && window.ttvcIsLowMemoryDevice() ? 25 : 50;
     const requestedPage = Math.max(1, parseInt(localStorage.getItem(pageKey) || '1', 10) || 1);
     const visibleCount = Math.min(chars.length, requestedPage * pageSize);
     const visibleChars = chars.slice(0, visibleCount);

static/js/voice-library.js

@@ -1827,7 +1827,7 @@ function renderVoiceList() {
     window._voicePage = 1;
   }
   const totalFiltered = filtered.length;
-  const pageSize = 50;
+  const pageSize = typeof window.ttvcIsLowMemoryDevice === 'function' && window.ttvcIsLowMemoryDevice() ? 25 : 50;
   const page = Math.max(1, Number(window._voicePage) || 1);
   const pageEnd = Math.min(totalFiltered, page * pageSize);
   const pageItems = filtered.slice(0, pageEnd);