Add config generator with TUI for training configuration

[gitttt-1234]

Summary

This PR adds a Config Generator tool that helps users create sleap-nn training configurations from SLP files with smart defaults based on data analysis.

Features

• Python API with fluent builder pattern (ConfigGenerator class)
• Auto-configuration based on dataset analysis (pipeline, backbone, sigma, batch size, etc.)
• Smart recommendations with reasoning for each parameter choice
• Memory estimation for GPU and CPU with color-coded warnings
• Interactive TUI with 4 tabs (Data → Model → Training → Export)
• CLI command: sleap-nn config <slp_file>

Usage Examples

Quick auto-config (Python):

from sleap_nn.config_generator import generate_config
generate_config("labels.slp", "config.yaml")

Fluent API (Python):

from sleap_nn.config_generator import ConfigGenerator

config = (
    ConfigGenerator.from_slp("labels.slp")
    .auto(view="top")
    .batch_size(8)
    .save("config.yaml")
)

CLI:

# Auto-generate config
sleap-nn config labels.slp -o config.yaml

# With view type hint
sleap-nn config labels.slp -o config.yaml --view top

# Interactive TUI
sleap-nn config labels.slp --interactive

# Analyze only
sleap-nn config labels.slp --analyze-only

New Files

• sleap_nn/config_generator/ - New module with:
  • analyzer.py - Dataset analysis (DatasetStats, analyze_slp())
  • recommender.py - Pipeline and parameter recommendations
  • memory.py - Memory estimation utilities
  • generator.py - Main ConfigGenerator class
  • tui/app.py - Interactive TUI application (Textual-based)
• tests/test_config_generator.py - 25 test cases

Dependencies

• Added textual>=0.40.0 (TUI framework, builds on existing rich dependency)

Test plan

• All 25 new tests pass
• Manual testing with real SLP files
• Test TUI on different terminals
• Verify generated configs work with sleap-nn train

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 44.80447% with 494 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.51%. Comparing base (ff91433) to head (acace23).
⚠️ Report is 124 commits behind head on main.

Files with missing lines	Patch %	Lines
sleap_nn/config_generator/tui/app.py	0.00%	356 Missing ⚠️
sleap_nn/config_generator/generator.py	75.00%	48 Missing ⚠️
sleap_nn/cli.py	24.44%	34 Missing ⚠️
sleap_nn/config_generator/analyzer.py	83.07%	22 Missing ⚠️
sleap_nn/config_generator/recommender.py	81.91%	17 Missing ⚠️
sleap_nn/config_generator/memory.py	80.00%	11 Missing ⚠️
sleap_nn/config_generator/__init__.py	80.95%	4 Missing ⚠️
sleap_nn/config_generator/tui/__init__.py	0.00%	2 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (ff91433) and HEAD (acace23). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (ff91433)	HEAD (acace23)
	4	3

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #438       +/-   ##
===========================================
- Coverage   95.28%   81.51%   -13.77%     
===========================================
  Files          49       81       +32     
  Lines        6765    11665     +4900     
===========================================
+ Hits         6446     9509     +3063     
- Misses        319     2156     +1837     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.