feat(hub): single node mode and alerts button on system detail page

[svenvg93]

📃 Description

Addresses two UX improvements for single-server setups and the system detail page.

Closes #1379 — adds an opt-in single node mode that automatically redirects to the system dashboard when only one system is configured, skipping the "All Systems" overview.

Closes #1927 — adds the alerts button to the system detail page so alerts can be edited without returning to the overview.

🪵 Changelog

➕ Added

• Single node mode setting in Settings → General: when enabled and exactly one system is configured, navigating to the home route redirects directly to that system's dashboard
• Alert bell button added to the system detail page info bar, matching the behaviour already present in the systems table

✏️ Changed

• Single node mode toggle is disabled and greyed out when more than one system exists
• Single node mode is automatically disabled when a second system is added

📷 Screenshots

[pascal-cm]

Very nice!

Could you also add the actions button next to the alert button? (The one with the three dots.)

Otherwise, in single node mode, there's no way of editing the instance.

This button:

Should be here:

[svenvg93]

Very nice!

Could you also add the actions button next to the alert button? (The one with the three dots.)

Otherwise, in single node mode, there's no way of editing the instance.

Good call! Missed that one. I added it for now next the Alert button. Not completely happy with how it looks as it feels a bit crowed now. I will play round with it to find a cleaner way to show them all.