Add transfer speed calculation to checksum progress output

[messa]

Summary

Enhanced the progress reporting for the checksum operation to display the current transfer speed in MB/s alongside the existing progress percentage.

Key Changes

• Track the last reported position (show_progress_last_output_pos) to calculate bytes transferred since the last progress update
• Calculate elapsed time and transfer speed (MB/s) between progress reports
• Display the calculated speed in the progress output with 1 decimal place precision
• Updated version from 0.0.2 to 0.0.3

Implementation Details

• Speed is calculated as: (bytes_since_last / (1024 * 1024)) / elapsed_seconds
• Handles edge case where elapsed time is 0 to avoid division errors
• Speed calculation only occurs when progress is actually reported (every 60 seconds or 5% progress increment)
• The speed represents the instantaneous transfer rate since the last progress report, providing users with real-time feedback on operation performance

[Copilot]

Pull request overview

This PR enhances the checksum operation's progress reporting by adding real-time transfer speed calculation and display. The implementation tracks bytes transferred between progress updates and calculates the instantaneous transfer rate in MB/s.

Changes:

• Added tracking of last output position to enable speed calculation between progress reports
• Implemented speed calculation (MB/s) with proper handling of division-by-zero edge case
• Updated progress output format to include transfer speed with 1 decimal precision
• Bumped version from 0.0.2 to 0.0.3

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
uv.lock	Updated revision and version to 0.0.3 to reflect the new release
blockcopy.py	Added speed calculation logic to checksum progress reporting, including tracking of last output position, elapsed time calculation, and updated output formatting

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