Fix stale selector fragments left by a renderer regression

[polymorcodeus]

Summary

Adds alternate-screen rendering for the interactive shelf, collection, and mark forms, printing the completion output after the program exits. This works around a regression introduced by the lipgloss/v2 2.0.6 bump, which transitively upgraded the ultraviolet renderer to a build that resizes its cell buffer before clearing a shrinking inline frame, leaving the tall selector visible above the shorter result.

What's new

• Alternate-screen forms - shelf, collection, and mark selectors render in the alternate screen buffer and are discarded on exit, so the completion output prints cleanly to the main buffer below the banner.
• Post-exit result rendering - each get and edit model exposes ResultView(), and a shared runProgram helper prints it after tea.NewProgram(...).Run() returns.
• Responsive status panel - the side status panel shrinks to fit the terminal width instead of a hardcoded 68 columns, and forms render empty until the first WindowSizeMsg arrives.

Behavior changes / guardrails

• The interactive form now runs in the alternate screen buffer and is discarded on exit; the result prints to the main buffer instead of lingering in the scrollback beside the form.
• No dependency is pinned or downgraded; the workaround lives in the app layer, so future dependency bumps do not reintroduce the bug.
• On narrow terminals the side panel shrinks rather than wrapping, and the first frame renders empty until the real terminal width is known.

Testing

• TUI rendering is verified manually across book mark list and the shelf and collection flows, which now show only the result with no selector fragments.
• make check runs fmt, vet, lint, and tests; all green.