refactor: Use sleap-io for analysis HDF5 and CSV exports

[gitttt-1234]

Summary

• Replace SLEAP's internal write_tracking_h5.py with sleap-io's save_analysis_h5() and save_csv() functions
• Consolidate analysis export logic into a single source of truth (sleap-io)
• Maintain backwards compatibility with existing analysis file readers

Changes Made

• sleap/io/format/sleap_analysis.py:

  • Use sio.load_analysis_h5() for reading (replaces 50+ lines of custom parsing)
  • Use sio.save_analysis_h5() for writing with preset="matlab" for SLEAP-compatible format

• sleap/io/format/csv.py:

  • Use sio.save_csv() with format="sleap" instead of write_tracking_h5(..., csv=True)

• sleap/io/convert.py:

  • Use sleap-io functions for both HDF5 and CSV analysis export in the CLI

Benefits

1. Single source of truth: Analysis export logic lives in sleap-io, reducing code duplication
2. Enhanced metadata: sleap-io adds dims attributes to datasets and file-level metadata (preset, format, sleap_io_version)
3. Consistent format: Exports from SLEAP GUI and sleap-io CLI now produce identical files
4. Better maintainability: Future enhancements (like Add option to analysis export that will export predictions for all frames (including those with no predictions) #1651 for full video length export) only need to be implemented in sleap-io

Backwards Compatibility

• Output files use preset="matlab" which produces the same axis ordering as the original implementation
• Extra HDF5 attributes are additive and won't break existing readers (MATLAB, Python, etc.)
• sleap-io's reader handles both old and new format files

Related Issues

• Related to Add option to analysis export that will export predictions for all frames (including those with no predictions) #1651 (Add option to export all frames including those with no predictions)
• Related to Add option to analysis export that will export predictions for all frames (including those with no predictions) #1622 (Original discussion about analysis export limitations)

Testing

• Manual testing of analysis HDF5 export from GUI
• Manual testing of CSV export from GUI
• Manual testing of sleap-convert --format analysis
• Verify output files can be read by existing scripts

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Codecov Report

❌ Patch coverage is 70.96774% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.52%. Comparing base (960fd9f) to head (37df3f6).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
sleap/io/format/sleap_analysis.py	44.44%	5 Missing ⚠️
sleap/io/format/csv.py	66.66%	3 Missing ⚠️
sleap/io/convert.py	92.30%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2649      +/-   ##
===========================================
- Coverage    64.54%   64.52%   -0.03%     
===========================================
  Files           95       95              
  Lines        20223    20205      -18     
===========================================
- Hits         13053    13037      -16     
+ Misses        7170     7168       -2     

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