feat: add Always On toggle to side settings UI

[ng]

Summary

• Adds Always On toggle to per-side settings form with Infinity icon
• Mutual exclusion: enabling Always On auto-disables Auto-off (and vice versa)
• Wires into existing settings.updateSide({ alwaysOn }) mutation

Closes #305

Test plan

• Toggle Always On — verify keepalive starts
• Toggle Always On while Auto-off is enabled — verify Auto-off is disabled
• Toggle Auto-off while Always On is enabled — verify Always On is disabled

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 83f292ec-f595-46cc-bd4e-d3e466d02c7f

📥 Commits

Reviewing files that changed from the base of the PR and between dfca8d2 and 2804fed.

📒 Files selected for processing (1)

• src/components/Settings/SideSettingsForm.tsx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/305-always-on-toggle

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