fscorrupt/posterizarr 3.3.7 on GitHub

Dedicated Sync Service: Integrated a fast, background Plex push engine powered by SQLite (plex_push_cache.db) that tracks artwork state and hashes.
Collection Explorer Diff Previews: Inspect side-by-side comparisons of local files vs. server artwork with live status tags (Synced, Pending Upload, Server Only, Local Only) and trigger one-click batch pushes.
Granular Scheduled Tasks: Automate synchronization specifically for Collections, Posters, Season Art, Title Cards, or Backgrounds with configurable rate limits.

SSRF Prevention: Validates external and server endpoints with is_safe_url to restrict arbitrary network access and protect cloud/LAN environments.
Strict Path Canonicalization: Enforces strict directory containment checks preventing path traversal when storing collection posters.
Payload Verification: Added magic-byte image validation, upload payload size caps, and server host verification.
Kometa (PMM) Guidance: Built-in advisories in the Scheduler UI and documentation to help users avoid conflicting metadata loops with Kometa.

Interactive Run Modals: Confirmation dialogs for Normal and Testing modes to review settings before execution.
Quick Run Preferences: Includes a "Don't show again" toggle stored in browser preferences, with a one-click reset option.
Seamless Testing Mode: Automatically redirects to the Test Gallery once generation completes and refreshes the preview.

Uptime Kuma Webhooks: Fixed a PowerShell string interpolation bug where $baseUrl?status caused webhooks to fail with Invalid URI: The hostname could not be parsed. URLs are now sanitized against accidental quotes or trailing parameters.
Parallel Title Card Generation: Fixed a race condition with ParallelJobs > 1 where concurrent season threads deleted a shared temporary image, causing Temp image is corrupt, cannot proceed errors.
UI Error Boundaries: Added React error boundaries around complex views to gracefully recover without crashing the page.

What's Changed

Sync Main2Dev by @fscorrupt in #670
Use a per-season temp image for title cards by @im85288 in #671
Plex Collection Diffing & Sync, Security Hardening, Run Mode Confirmations & Webhook Fixes by @fscorrupt in #672
fix(security): prevent clear-text logging of sensitive credentials by @fscorrupt in #673

Full Changelog: 3.3.6...3.3.7