feat: rename package from sepal_ui to pysepal (Phase 2)

[dfguerrerom]

Summary

• Renames the source directory sepal_ui/ → pysepal/ and updates all internal imports, tests, docs, templates, and notebooks
• Adds a backward-compatibility shim at sepal_ui/__init__.py that redirects all sepal_ui.* imports to pysepal.* with a DeprecationWarning
• Updates pyproject.toml distribution name from sepal-ui to pysepal (entry points, coverage, codespell, commitizen)
• Adds dual-read logic in module_deploy and template noxfiles to accept both [pysepal] and [sepal-ui] config sections
• Keeps ~/.sepal-ui-config, sepalui logger namespace, and sepal-ui-script CSS class unchanged for backward compatibility

What is NOT renamed (deferred)

Item	Reason
~/.sepal-ui-config file path	Would break user settings
[sepal-ui] ConfigParser section	Dual-read added instead
sepalui logger namespace	Would break downstream logging config
sepal-ui-script CSS class	DOM-level, no benefit
GitHub repo URL/org	Phase 3

Test plan

• import pysepal works for all entry paths
• import sepal_ui still works via shim with deprecation warning
• from sepal_ui.sepalwidgets import AppBar redirects correctly
• Full test suite passes (273/273, 7 skipped)
• module_deploy dual-read accepts both [pysepal] and [sepal-ui]
• CI passes
• Docs build on RTD

References

• Issue: change the repository name #967
• Phase 1 (deprecation warnings): Issue 967 phase1 deprecation #973
• Design doc: docs/plans/2026-03-02-phase2-rename-design.md
• Implementation plan: docs/plans/2026-03-02-phase2-rename-plan.md

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 91.71975% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.97%. Comparing base (bc7e872) to head (92066dd).

Files with missing lines	Patch %	Lines
pysepal/sepalwidgets/file_input.py	0.00%	3 Missing ⚠️
pysepal/solara/session_manager.py	0.00%	3 Missing ⚠️
pysepal/solara/utils.py	0.00%	3 Missing ⚠️
pysepal/scripts/gee.py	66.66%	1 Missing ⚠️
pysepal/scripts/sepal_client.py	0.00%	1 Missing ⚠️
pysepal/scripts/thread_controller.py	0.00%	1 Missing ⚠️
pysepal/solara/decorators.py	0.00%	1 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #975      +/-   ##
==========================================
- Coverage   80.00%   79.97%   -0.03%     
==========================================
  Files          56       56              
  Lines        5546     5544       -2     
==========================================
- Hits         4437     4434       -3     
- Misses       1109     1110       +1     

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