fix(audio): silently handle known codec/media infrastructure errors

**refactor(ui):** enhance no-results empty state with detailed threshold hint and overlay styling

**refactor(ui):** consolidate empty state messages into StackPanel with per-state DataTriggers

refactor(ui): add "no similar images found" empty state with HasSearchedSimilar flag

fix(ui): fix loading overlay visibility trigger precedence

refactor(ui): replace inline ProgressRing with full loading overlay and message

fix(ui): resolve binding errors for image dimensions in MainWindow

docs(readme): add badges, project architecture overview, and recent refactor summary

chore(version): bump assembly and file version to 2.6

Update mame.dat

refactor(threading): improve async patterns, thread safety, and resource management across services

perf(ui): cache context menus to reduce memory allocations and improve right-click performance

refactor: improve thread safety, simplify async patterns, and enhance resource cleanup

**Refactor:** enhance ErrorLogger concurrency with granular locking and exception isolation, ensure UI thread safety in AudioService, add atomic writes for settings/images, handle missing mame.dat gracefully, and minor cleanups.

Refactor: add robust retry logic for image writing to handle file locks (OneDrive/antivirus), adopt C#12 features (static lambdas, pattern matching, source-generated regex), improve Windows version detection, and enhance ROM folder input validation.