eDit: Enable album-level field editing during interactive import

[arsaboo]

Description

During interactive import, the edit plugin only exposed item-level fields — the albumfields configuration was completely ignored in importer_edit(). Users who wanted to modify album-level fields such as album or year had to complete the import, then run beet edit -a QUERY as a separate step.

Solution

Updated importer_edit() to support editing album-level fields during import. Album fields (configured via albumfields) are presented as a YAML header section prepended to the per-track documents. Changes to the header are applied to all items in the album, making album-level edits work in both the eDit and edit Candidates choices.

• Documentation. (If you've added a new command-line flag, for example, find the appropriate page under docs/ to describe it.)
• Changelog. (Add an entry to docs/changelog.rst to the bottom of one of the lists near the top of the document.)
• Tests. (Very much encouraged but not strictly required.)

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds support for editing album-level fields during interactive album imports by introducing a YAML header section, along with refactoring the edit flow and expanding documentation/tests.

Changes:

• Show albumfields as a YAML header document during interactive album import editing.
• Refactor YAML editing into _edit_yaml and extend importer edit logic to handle header + per-track documents.
• Add tests and update docs/changelog to describe the new behavior.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 7 comments.

File	Description
beetsplug/edit.py	Implements album-header YAML + refactors edit loop into _edit_yaml and new importer edit application logic.
test/plugins/test_edit.py	Adds tests for album-header editing during import.
docs/plugins/edit.rst	Documents the new album-header behavior during interactive import editing.
docs/changelog.rst	Announces the new interactive import album-header feature.

[codecov]

Codecov Report

❌ Patch coverage is 66.95652% with 38 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.74%. Comparing base (8bfcfb1) to head (6b84234).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
beetsplug/edit.py	66.95%	27 Missing and 11 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6727      +/-   ##
==========================================
- Coverage   74.78%   74.74%   -0.05%     
==========================================
  Files         163      163              
  Lines       20966    21075     +109     
  Branches     3302     3326      +24     
==========================================
+ Hits        15680    15752      +72     
- Misses       4529     4556      +27     
- Partials      757      767      +10     

Files with missing lines	Coverage Δ
beetsplug/edit.py	77.97% <66.95%> (-7.74%)	⬇️

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[snejus]

Before I review, again, please undo the removal of all comments.

[arsaboo]

Apologies....restored the explanatory comments and reverted any unrelated changes.