D49 — Interactive cartographer connect: bubbletea form shared TUI/CLI

Decision. The connect form (server URL, name, token env var, auth toggle) is extracted into a standalone bubbletea component, connectFormModel (connectform.go), reused unchanged by TUI and CLI. A standalone field decides whether submit/cancel emit tea.Quit (command running its own program) or stay no-op (form nested in the TUI, which reacts to Submitted()/Cancelled()). cmdConnect opens the form (new --no-input flag as escape hatch) only if none of the four form flags was passed explicitly and both stdin and stdout are a TTY (wantsConnectForm, a pure function testable without a real tea.Program). Rationale. The delicate constraint is "the nested form must never emit tea.Quit": without the standalone field the TUI would exit every time the user closes the connect form. Same struct, same Update, parametric quitting behavior instead of two parallel implementations. Details: docs/configurator.md §cartographer connect [provider|all], §TUI mode.