fix(tui): use cross-platform path splitting for local plugin names in status dialog

[licat2023]

Issue for this PR

Closes #33373
Closes #16559

Type of change

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

What does this PR do?

On Windows, fileURLToPath() returns paths with \ separators,
but the Status dialog display logic in packages/tui/src/component/dialog-status.tsx
only splits on /. The entire path is kept as a single string, and
.split(".")[0] truncates at the .config dot, showing C:\Users\licat\
instead of the plugin directory name.

This PR adds .replace(/\\/g, "/") before the split call to normalize
Windows backslashes, so the path component extraction works on all platforms.

How did you verify your code works?

• bun typecheck passes in packages/tui/
• Manually tested on Windows: added a local plugin path to opencode.json,
  opened the Status dialog, confirmed the plugin name displays its directory
  basename instead of a truncated path
• Unix paths (no backslashes) are unchanged — no regression

Screenshots / recordings

Before	After
C:\Users\licat\	opencode-lazy-loader

Before:

After:

Checklist

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

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[github-actions]

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