feat(build): UI surfaces richer discovery + stack settings + Apple/Xcode Cloud + CSS fixes
- ui/src/build-config.ts: surface suggested_stack, distro, git ref/tag/SHA,
Linux packages, computed build options, stack-specific settings
(build_tags, obfuscation, cache, Deno, NSIS, WebView2, Docker/LinuxKit),
Apple/Xcode Cloud config
- CSS fixes: colour → color across build-config/artifacts/panel/sdk .ts
- pkg/api/ui/dist/core-build.js: rebuilt embedded bundle
Verified: npm run build + go test ./... passes
Co-Authored-By: Virgil <virgil@lethean.io>