The app crashed on startup because the image-ico Tauri feature was
missing, causing Image::from_bytes to panic when decoding icon.ico.
Added the feature flag and replaced env_logger with fern to log to both
stderr and <data_dir>/triple-c/logs/triple-c.log. A panic hook captures
crash details with backtraces. Store init and icon loading errors are now
logged before failing so future issues are diagnosable from the log file.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
