Onboarding should recommend extensions to enable

[hanthor]

What happened

Compass supports Raycast-compatible extensions from its extension store, but the onboarding wizard never mentions them. A new user finishes setup without learning extensions exist or which ones are worth enabling.

What I expected

Onboarding includes a step that points at extensions the user may want — recommended store extensions with a way to enable or install them before finishing setup.

Steps to reproduce

1. Run Compass with a fresh config so the onboarding wizard appears.
2. Step through the whole wizard.
3. Observe extensions are never mentioned anywhere in the flow.

Additional context

None — can start immediately.

[hanthor]

Done in #255 and #256. Onboarding has an extensions step with one-click installs: four Raycast extensions (Google Translate, Google Search, GIF Search, Tailwind CSS) and three from the Vicinae store (Bluetooth, Wifi Commander, Flathub). Each one renders in Suite 1.

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