fish: complete files in more places

[9999years]

Description

Normally, the Fish completion plugin won't complete filenames, which is useful for beet import and similar! This removes the -f (no filename completion) flag from various places in the output.

To Do

• 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.)

[github-actions]

Thank you for the PR! The changelog has not been updated, so here is a friendly reminder to check if you need to add an entry.

[Copilot]

Pull request overview

This PR enhances the Fish shell completion plugin by enabling filename completion in appropriate contexts, particularly useful for commands like beet import that operate on files and directories.

Changes:

• Modified Fish completion flags to enable filename completion for file/directory path arguments
• Removed -f (no-file-completion) flag from general command completions to allow files to be completed alongside other options
• Changed -f to -F (force-file-completion) for options that specifically require file or directory paths

Reviewed changes

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

File	Description
docs/changelog.rst	Added changelog entry documenting the new filename completion behavior
beetsplug/fish.py	Updated Fish completion generation to use -F for file/directory path options and removed -f from general completions to enable filename completion

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[snejus]

Nice - looks good. Just resolve the conflict in the changelog and we're good to go!

[9999years]

@snejus Fixed the merge conflict. In the future, it might be worth having a system where PRs add release notes in different files to a common directory, and then we have a script that gets run when we release which combines all those files into a single changelog, to avoid merge conflicts.