Update dependency anomalyco/opencode to v1.18.3

[vinnyang]

This PR contains the following updates:

Package	Update	Change
anomalyco/opencode	patch	1.18.2 → 1.18.3

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Release Notes

anomalyco/opencode (anomalyco/opencode)

v1.18.3

Compare Source

Core

Improvements

• Added an Up Arrow shortcut to close the subagent picker when the first item is selected.

Desktop

Bugfixes

• Fixed home page scrolling so sticky headers and the session list behave correctly.
• Fixed startup readiness so WSL server loading is included before the desktop app reports ready.
• Removed the inactive help button from the app layout.
• Fixed custom agent selector visibility when custom agents are available.

Improvements

• Home page command palette search can now find and open sessions.

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