v[1.2.0] - 2025-12-26 [dbc1aeb]

Added

• FFmpeg Integration: Introduced FfmpegWaveformService and PrerequisiteService to replace just_waveform. This enables high-performance peak extraction (4kHz sampling, 200-peak fixed resolution).
• Startup Workflow: Added StartupScreen to handle environment validation, FFmpeg detection, and provided user-oriented installation instructions.
• Hierarchical Navigation: Added VerseSidebar for multi-verse navigation and Verse model to support more complex document structures.
• UI Components: Implemented LiturgyControlHub and WaveformScrubber (via simple_timeline_scrubber.dart) to provide integrated playback controls.

Changed

• UI/UX Refactor: Comprehensive redesign of the interface and theme consistency.
• Performance Optimization: Enhanced WaveformPainter using RepaintBoundary and cached Paint objects to ensure smooth rendering.
• Improved Interaction: Centered and enlarged chain icons; functionalized the audio speed adjuster (0.5x - 1.5x).
• Code Maintenance: Hardened the codebase by updating deprecated members, implementing structured logging via the logging package, and cleaning up dependencies (path, logging).

Removed

• Redundancy: Deleted lib/ui/widgets/word_button.dart in favor of internal _WordCard implementation.
• Package Reduction: Removed just_waveform dependency due to compatibility issues.