Lipsync Fixes

What's Changed

• Extract PluginSync three-way merge for unit testing (#94) by @benklop in #99
• Stop syncing Jellyseerr API keys via plugin settings by @benklop in #97
• Fix auth preferences v2 migration clearing last_user_id (#92) by @benklop in #98
• Add Jellyseerr MockWebServer unit tests by @benklop in #110
• Add PR artifact download links for manual testing by @benklop in #111
• Fix browse poster aspect ratio after PR #11 padding clamp by @benklop in #109
• Fix gradual A/V lip sync drift during playback by @benklop in #112
• Bump stonecrusher.version on master after release publish by @benklop in #113
• Append AudioDelayProcessor after default Media3 chain by @benklop in #114

Full Changelog: v1.8.4...v1.8.5