fix(opencode): resolve directory when list sessions

[way-zer]

Issue for this PR

Fixes#21340
Closes#14570#20165#19672

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Please provide a description of the issue, the changes you made to fix it, and why they work. It is expected that you understand why your changes work and if you do not understand why at least say as much so a maintainer knows how much to value the PR.

If you paste a large clearly AI generated description here your PR may be IGNORED or CLOSED!

How did you verify your code works?

Tested on windows, with both Curl and UI.

//Before
http://127.0.0.1:4096/session?directory=E:\Projects\xxxx&roots=true&limit=55
> [ 11 sessions ]
http://127.0.0.1:4096/session?directory=E:/Projects/xxxx&roots=true&limit=55
> [ 0 sessions ]
//After
http://127.0.0.1:51166/session?directory=E:\Projects\xxxx&roots=true&limit=55
> [ 11 sessions ]
http://127.0.0.1:51166/session?directory=E:/Projects/xxxx&roots=true&limit=55
> [ 11 sessions ]

Screenshots / recordings

If this is a UI change, please include a screenshot or recording.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

If you do not follow this template your PR will be automatically rejected.

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Based on my search, I found two potentially related PRs:

1. PR fix(sdk): avoid implicit directory filtering on /session list #20361 - "fix(sdk): avoid implicit directory filtering on /session list"

   • fix(sdk): avoid implicit directory filtering on /session list #20361
   • Related: Addresses directory filtering issues with session listing, similar domain to the current fix

2. PR fix(session): accept directory when creating sessions #21131 - "fix(session): accept directory when creating sessions"

   • fix(session): accept directory when creating sessions #21131
   • Related: Deals with directory handling in session operations, potentially overlapping with the current directory resolution fix

These PRs are in the same problem space (directory handling in sessions) and may have related or overlapping concerns, though they appear to address slightly different aspects of the issue.

[way-zer]

One unit test fail, but seems having nothing to do with this PR:

1 tests failed:
(fail) tui.plugin.loader > installs themes in the correct scope and remains resilient