fix(tui): restore open web ui command

[alexyaroshuk]

closes #11031

What does this PR do?

Fixes the "Open WebUI" button in the TUI (Ctrl+P menu). It was disabled in commit 578361de642c9787bdc0654bc6e82e3b4ccf2527

Previously, clicking it tried to open http://opencode.internal which doesn't work in browser.

How did you verify your code works?

1. Ran in executable
2. ran test suite to ensure no regressions

[github-actions]

Thanks for your contribution!

This PR doesn't have a linked issue. All PRs must reference an existing issue.

Please:

1. Open an issue describing the bug/feature (if one doesn't exist)
2. Add Fixes #<number> or Closes #<number> to this PR description

See CONTRIBUTING.md for details.

[github-actions]

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

Based on my search, I found two potentially related PRs that are addressing WebUI functionality in the TUI:

1. PR fix(tui): start server on-demand when opening WebUI from command palette #8409 - "fix(tui): start server on-demand when opening WebUI from command palette"

   • fix(tui): start server on-demand when opening WebUI from command palette #8409
   • Related because it also deals with opening WebUI from the TUI menu

2. PR fix(tui): show warning when opening WebUI without server mode #8849 - "fix(tui): show warning when opening WebUI without server mode"

   • fix(tui): show warning when opening WebUI without server mode #8849
   • Related because it also handles WebUI opening functionality in the TUI

However, these appear to be older PRs addressing similar but distinct issues (server initialization and warnings). PR #11050 specifically fixes the restoration of the "Open WebUI" button that was disabled, which seems to be a targeted fix for a regression.

[bobthearsonist]

✅ Tested on Windows 11 - Works perfectly!

• Built from branch and ran the executable
• Ctrl+P shows 'Open Web UI' command
• Clicking it successfully opens the browser to the web interface

Thanks for the quick fix! 🎉