v2.3.0

• Native thumbnail provider for macOS and Windows (WIC-based on Windows,
  NSImage-based on macOS) integrated into ClipboardService

• Asynchronous image processing queue (ImageProcessingQueue) with async
  disposal and retry logic for clipboard capture

• ThumbnailQueue: stale-item handling, logging, and new isIdle property
  for accurate queue-state inspection

• New DB fields: thumbPath and sourceModifiedAt on ClipboardItem with
  automatic schema migration

• WebP encoding support added and then removed in favour of native
  platform codecs; BMP retained as universal fallback for unsupported formats

• Improved orphan-image cleanup and safety checks for file deletion in
  ClipboardService

• CleanupService: image quota enforcement (imagesQuotaMB) to cap disk
  usage by stored images

• CleanupService: tracking of broken external references across service
  restarts; thumbnails are preserved during cleanup passes

• Paste-preset options and reset-filters-on-show toggle in Settings

• Multimedia and cleanup settings exposed in onboarding and Settings screens

• Simplified onboarding: removed personalisation step to reduce friction

• AppConfig extended with keepBrokenItemsDays, resetFiltersOnShow and
  imagesQuotaMB fields

• Release manifest service with Ed25519 signature verification

• Blocked-version detection with InstallChannelDetector and UrlHelper
  platform overrides; blocked-version screen with per-channel upgrade URLs

• Update-available store messages clarified in English and Spanish

• release-manifest.json: latest=2.3.0, minimumSupported=2.3.0,
  blockedVersions=["2.2.6"], severity=critical

• Fix async disposal order in service teardown to avoid race conditions

• Fix safety checks preventing accidental deletion of unrelated files

• Fix BMP fallback path when clipboard image format is unsupported

• Codecov: PR comments enabled with diff-per-file and per-flag breakdown;
  require_changes=true to avoid noise on doc-only PRs

• GitHub Actions: pull-requests: write permission added for bot comments

• Removed auto_updater_macos / Sparkle dependency from Podfile.lock

• New/extended tests: ImageProcessingQueue, ThumbnailQueue, MacOS/Windows
  native thumbnail providers, SQLite migration, thumb path retrieval,
  ClipboardService reclassification, SettingsScreen smoke tests,
  AppConfig (keepBrokenItemsDays, resetFiltersOnShow, imagesQuotaMB),
  BlockedVersionScreen with channel URL resolution

What's Changed

• fix: retain BMP fallback for unsupported image formats in clipboard p… by @rgdevment in #40

Full Changelog: v2.2.6...v2.3.0