fix(app): tolerate incomplete agent configuration

[OpeOginni]

Issue for this PR

Fixes #44023

Type of change

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

What does this PR do?

Fixes a whole-app crash on desktop when a connected server runs an older opencode version.

normalizeAgentList reads agent.request.settings.temperature unguarded. Servers built before 140224b (2026-07-02) serialize agents as request: { headers, body } without settings, the client stores API responses without validation, and the normalizer runs inside a reactive computation during bootstrap — so the TypeError escapes to the root error boundary and the app never loads. Restarting refetches the same response and crashes again.

The fix defaults the missing fields (agent.request?.settings ?? {}, agent.permissions ?? []) so a malformed agent degrades to default temperature/topP instead of killing the app. Output is unchanged for well-formed agents.

How did you verify your code works?

• Added unit tests feeding the exact old-server shape into normalizeAgentList — they throw the reported TypeError before the fix and pass after (bun test src/runtime/server/global-sync/utils.test.ts).
• Reproduced end-to-end: ran opencode-ai@0.0.0-beta-202607011659 serve, confirmed its /api/agent returns request without settings, and that the desktop app loads fine against it with this fix.
• bun run typecheck in packages/app passes.

Screenshots / recordings

Checklist

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

[github-actions]

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