[Improve] Use a light bulb icon for the Advisor model setting

[roomote-roomote]

Opened on behalf of Matt Rubens. Follow up by mentioning @openmote, in the web UI, or in Slack.

Related issue

N/A — internal Roomote UX polish from Slack.

Why this PR exists

• A maintainer explicitly invited this PR in the linked issue or discussion
• I am a maintainer / this is internal Roomote work

What changed

On Settings → Models, the Advisor model role now uses a light bulb icon instead of the previous scroll icon.

How it was tested

• pnpm lint and pnpm --filter @roomote/web check-types
• Manual browser check on /settings/models after dev login; Advisor row shows the light bulb icon

Screenshots

Checklist

• The PR title follows the repo convention: [Fix], [Feat], [Improve], [Refactor], [Docs], or [Chore] followed by a user-facing description
• This PR is small and scoped to one change
• pnpm lint and pnpm check-types pass locally
• I added tests or included a clear manual validation note above
• I removed secrets, tokens, private keys, and customer data from code, logs, and screenshots
• If this change should appear in the changelog, I ran pnpm changeset

[roomote-roomote]

No code issues found. See task

Reviewed the icon swap on apps/web/src/components/settings/ModelSettingsSection.tsx: Lightbulb replaces ScrollText for the Advisor model role. The Lightbulb icon is exported from the shared icons module, the import stays alphabetically ordered, and ScrollText is still used by other components so removing the unused import here is safe. No functional, type, or correctness concerns.