fix(anime): scope preferences, paginate sources, harden installs

- Preference store keys entries by extension package + bridge source id; legacy unscoped entries are discarded once instead of being handed to whichever extension asks first
- Source picker's "Load more" appends the next page without duplicating streamed results
- Repository index fetches and subtitle/APK downloads now time out and are size-bounded instead of hanging or growing unbounded
- APK installs are staged to a temp file and renamed into place
- Stream metadata lookup matches the requested path, not only the currently playing one
- Reworked animeui into browse-state/detail-panel/panels.css modules
- Reverted premature CHANGELOG unreleased entries; refreshed anime-browser docs

scripts/prepare-build-assets.mjs

@@ -27,9 +27,11 @@ function copyFile(sourcePath, outputPath) {
   fs.copyFileSync(sourcePath, outputPath);
 }
 
-function copyAssets(sourceDir, outputDir, label) {
+function copyAssets(sourceDir, outputDir, label, stylesheets = ['style.css']) {
   copyFile(path.join(sourceDir, 'index.html'), path.join(outputDir, 'index.html'));
-  copyFile(path.join(sourceDir, 'style.css'), path.join(outputDir, 'style.css'));
+  for (const stylesheet of stylesheets) {
+    copyFile(path.join(sourceDir, stylesheet), path.join(outputDir, stylesheet));
+  }
   fs.cpSync(path.join(rendererSourceDir, 'fonts'), path.join(outputDir, 'fonts'), {
     recursive: true,
     force: true,
@@ -50,7 +52,11 @@ function copySyncUiAssets() {
 }
 
 function copyAnimeUiAssets() {
-  copyAssets(animeUiSourceDir, animeUiOutputDir, 'animeui');
+  copyAssets(animeUiSourceDir, animeUiOutputDir, 'animeui', [
+    'style.css',
+    'detail.css',
+    'panels.css',
+  ]);
 }
 
 function fallbackToMacosSource() {