fix(ui): clear permission after response

[donicrosby]

Remove the accepted permission from the local sync cache after the server confirms the response so child-session permission prompts do not remain stuck in the composer.

Ultraworked with Sisyphus

Issue for this PR

Closes #26907

Type of change

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

What does this PR do?

When a child session permission response succeeds, remove that permission from the local sync cache. The server already accepts the response, but the composer can keep rendering the stale permission prompt until another sync event arrives.
This keeps the UI state aligned with the confirmed server response so the prompt clears immediately after approval.

How did you verify your code works?

• Reproduced the stale child-session permission prompt with Chrome DevTools MCP.
• Verified the prompt clears after clicking "Allow once" with this fix applied.
• bun typecheck from packages/app
• bun run build from packages/app
• bun test --preload ./happydom.ts ./src/context/global-sync/event-reducer.test.ts
• Push hook: bun turbo typecheck
  Note: session-composer-state.test.ts fails on clean HEAD with a Solid router client-only import error before running tests, so that failure is pre-existing.

Screenshots / recordings

Before, after clicking "Allow once", the permission prompt could remain stuck in the composer:
Permission prompt stuck before fix

After this change, the confirmed permission response clears the prompt from the composer:
Permission prompt cleared after fix

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.

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[github-actions]

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