feat: inject bundled mpv plugin for managed launches, remove legacy glob

- SubMiner-managed launcher and Windows shortcut launches inject the bundled plugin when no global plugin is detected
- First-run setup detects and removes legacy global plugin files via OS trash before managed playback starts
- Makefile `install-plugin` target and Windows config-rewrite script removed; Linux/macOS install now copies plugin to app data dir
- AniList stats search and post-watch tracking now go through the shared rate limiter
- Stats cover-art lookup reuses cached AniList data before issuing a new request
- Closing mpv in a launcher-managed session now terminates the background Electron app

backlog/completed/task-351 - Remove-legacy-global-mpv-plugin-from-setup.md

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+---
+id: TASK-351
+title: Remove legacy global mpv plugin from setup
+status: Done
+assignee: []
+created_date: '2026-05-12 19:57'
+updated_date: '2026-05-12 20:03'
+labels:
+  - setup
+  - mpv-plugin
+  - launcher
+  - windows
+dependencies: []
+priority: high
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+Add first-run setup support for detecting all legacy SubMiner mpv plugin auto-load entries and removing them via the OS trash after user confirmation, so regular mpv stops loading SubMiner while SubMiner-managed playback can use runtime plugin loading.
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [x] #1 Setup detects all SubMiner mpv auto-load candidates under normal mpv scripts directories and Windows portable_config scripts directories.
+- [x] #2 Setup displays detected legacy plugin paths and offers a Remove legacy mpv plugin action.
+- [x] #3 Removal uses Electron shell.trashItem for detected script files/directories and never permanently deletes as fallback.
+- [x] #4 script-opts/subminer.conf is not removed by the legacy plugin removal action.
+- [x] #5 Partial trash failures report exact failed paths and keep legacy plugin warning visible.
+- [x] #6 Successful removal refreshes setup status and reports that regular mpv will no longer load SubMiner while SubMiner-managed playback keeps working.
+<!-- AC:END -->
+
+## Final Summary
+
+<!-- SECTION:FINAL_SUMMARY:BEGIN -->
+Implemented setup detection for all legacy SubMiner mpv auto-load candidates in normal and portable mpv script directories, added a confirmed Remove legacy mpv plugin action that uses Electron shell.trashItem only, preserves script-opts/subminer.conf, reports exact partial failures, and refreshes setup status after successful removal. Added focused tests plus changelog/docs updates.
+<!-- SECTION:FINAL_SUMMARY:END -->