Fix startup/env-builder provider mapping and rendering regressions

Polish env-builder UX with quick guide and required selector

Merge branch 'main' into edit

chore: remove legacy alias env vars from env-builder

chore: remove legacy Telegram user ID aliases from env-builder

chore: remove dead env vars from env-builder

Simplify env-builder import flow and prevent accidental auto-apply

Enhance Space Privacy Detection, Proxy Defaults, and Environment Builder UX

Implement auto-check for checkboxes in env-builder

Implement auto-import and live typing for env input

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