feat: pick the share key in Go to, or by reference

Sharing without share.key opens Go to as a picker of secrets instead
of asking for a link: it lists only secrets, enter picks one, and a
pasted reference picks it too. The key, there and in share.key or
--key, can be a secret's lazysecrets:// link, Key Vault URL or
@Microsoft.KeyVault(...) reference.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

internal/ui/app/links.go

@@ -818,6 +818,9 @@ func (m *Model) openText(s string) tea.Cmd {
 
 // handlePaste opens a pasted reference, unless a text input has focus.
 func (m *Model) handlePaste(msg tea.PasteMsg) tea.Cmd {
+	if m.search != nil && m.search.pick != nil {
+		return m.pickPasted(msg.Content) // a reference to the secret
+	}
 	if p := m.prompt; p != nil && p.input != nil {
 		in, cmd := p.input.Update(msg)
 		p.input = &in