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fix: add DPI-correct window-local region capture for browser web clip/snipping

fix: settings.rs compile error - screenshots crate image version mismatch, convert raw pixels manually"

fix: settings.rs - correct screenshots API: convert RgbaImage to DynamicImage before PNG encode

fix: settings.rs - use image crate PNG encoder for screenshots (screenshots 0.8 API compat)

feat: settings.rs - add screen_capture_region + board_export_file + board_import_file commands

fix: settings.rs - board_load_state/board_save_state use raw file read/write to avoid double JSON encoding

feat: Rust - add board_load_state/board_save_state commands for board-first persistence

Phase 0 MUSE alpha skeleton and SRS docs