fix(ui): config generator never mounts ConfigGeneratorYamlPreview, so it never shows the user the YAML it generates

[JSONbored]

Context

components/site/app-panels/config-generator-yaml-preview.tsx:10 is a fully-implemented component, but is imported only by its own test file (config-generator-yaml-preview.test.tsx:4) — no real route/panel mounts it. config-generator-panel.tsx:1-18 (the actual config generator UI) builds formState via AiProviderModeFieldGroup + ReesAnalyzerFieldGroup but never renders ConfigGeneratorYamlPreview, meaning the config generator's own generated YAML is never actually shown to the user — the one thing this tool exists to produce.

Requirements

• Mount ConfigGeneratorYamlPreview inside config-generator-panel.tsx, wired to the same formState the field groups already build, so the generated YAML is visibly shown as the user fills in the form.
• Do not change ConfigGeneratorYamlPreview's own rendering logic — it's already implemented and tested; this is purely a "mount it" fix.
• This is a UI-only change under apps/**.

Deliverables

• config-generator-panel.tsx renders ConfigGeneratorYamlPreview, reflecting the live formState.

Expected Outcome

A user using the config generator actually sees the YAML it's producing, instead of filling in a form that visibly produces nothing.

Links & Resources

• apps/loopover-ui/src/components/site/app-panels/config-generator-yaml-preview.tsx:10
• apps/loopover-ui/src/components/site/app-panels/config-generator-panel.tsx:1-18

[linear-code]

JSO-4292