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

docs-site/.vitepress/theme/mermaid-modal.css

@@ -45,9 +45,7 @@
   border: 1px solid var(--vp-c-border);
   border-radius: 0;
   background: var(--vp-c-bg);
-  box-shadow:
-    0 8px 32px rgba(0, 0, 0, 0.3),
-    0 24px 64px rgba(0, 0, 0, 0.2);
+  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3), 0 24px 64px rgba(0, 0, 0, 0.2);
   overflow: hidden;
 }
 
@@ -64,9 +62,7 @@
   font-family: var(--tui-font-mono);
   font-size: 12px;
   cursor: pointer;
-  transition:
-    border-color 180ms ease,
-    color 180ms ease;
+  transition: border-color 180ms ease, color 180ms ease;
 }
 
 .mermaid-modal__close:hover {