refactor: Overhaul Plugin Architecture & Playground UI (#1846)

* refactor: Move Plugins Out and Consolidate with Multisrc

* feat: Overhaul Playground UI

* feat: Add Filters to New UI

* feat: Persist Selected Plugin

* feat: Add Direct Parse Novel/Chapter Options and Feedback Toasts

[skip ci]

* feat: UX Improvements

* chore: Update Plugin Path in Publish Workflow

* fix: Add Backward Compatibility

* chore: Update Plugin Publishing Script

src/libs/defaultCover.ts

@@ -1,2 +1,5 @@
-export const defaultCover =
-  'https://github.com/LNReader/lnreader-plugins/blob/main/icons/src/coverNotAvailable.jpg?raw=true';
+/**
+ * Backward compatibility for 3.0.0 - Re-exports from new location
+ * TODO: Remove in 4.0.0
+ */
+export { defaultCover } from '../types/constants';