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* fix(app): auto-set ref picker from a single attached PR Attaching a PR in the new-workspace composer signals "I want this PR's context", and almost always also means "base the worktree on this PR". Until now the two paths were independent: the ref picker stayed on the default branch, so the worktree was branched off main even though the sidebar chip looked like a PR checkout. Auto-promote the picker when exactly one PR is attached and the user hasn't manually picked a ref. Manual picker selections are preserved; auto-promoted ones are cleared when their backing attachment is removed. * refactor(app): derive auto-promoted picker selection instead of syncing The previous version drove `pickerSelection` from a useEffect that inspected attachments and overwrote state. That meant the shared `PickerSelection` type had to grow a `source: "manual" | "attachment"` discriminator just so the effect could tell its own writes apart from manual picks. Classic effect-as-derived-state. Split the state instead. `manualPickerSelection` holds explicit picks; `autoPickerItem` is a useMemo over composer attachments; the effective `pickerSelection` is `manual ?? auto` via a small precedence helper. No effect, no `source` flag, and `PickerSelection` stays a screen-local shape since nothing outside needs it.