Skip fully hidden forms to stop terminal capability-reply leaks

[polymorcodeus]

Summary

Adds a NonInteractive screen contract so forms with no visible groups skip tea.NewProgram entirely. Fixes the
stray ^[[?2026;2$y^[[?2027;2$y escape replies leaking into the shell prompt after interactive shelf list runs.

What's new

• model.NonInteractive - a screen whose form has nothing to ask implements SkipProgram() bool; runProgram
  prints its ResultView directly instead of starting a program that quits instantly.
• Completed by construction - the all-hidden shelf list form is marked huh.StateCompleted in its constructor,
  so the result view renders without a program run.
• Shared result tail - runProgram's error and completion handling is factored into printResult, used by both
  the program and skip paths.

Behavior changes / guardrails

• Root cause is upstream: a tea program that quits within milliseconds races the terminal's mode 2026/2027
  capability replies into the tty buffer (If tea program quits too early, garbage chars are printed charmbracelet/bubbletea#1590). Skipping the program removes the race instead of
  timing around it.
• Only shelf list is affected; collection list and mark list keep visible selector groups and still run
  interactively.
• Visible output is unchanged (spinner, banner, completed-view box), minus a sub-millisecond empty alt-screen flash.

Testing

• New internal/model unit test pins SkipProgram per action and verifies the list result renders immediately after
  construction.
• A pty harness emulating kitty's query replies reproduces the leak 5/5 before the fix and 0/5 after, with identical
  result output.
• make check runs fmt, vet, lint, and tests; all green.