Cursor blink stops firing entirely on iTerm2 (huh.Input never re-renders while idle

[cavesubmarine]

Description

A huh.Input field's cursor is supposed to blink (default cursor.CursorBlink mode) once focused, re-rendering every BlinkSpeed (~530ms). On iTerm2, it doesn't blink at all — not
just visually, but the underlying Bubble Tea program never re-renders during idle time. Captured raw terminal output confirms only a single frame is written for the entire idle period;
no BlinkMsg-triggered redraw ever happens.

To Reproduce

Minimal repro:

package main

import (
      "fmt"

      "charm.land/huh/v2"
)

func main() {
      var s string
      f := huh.NewForm(huh.NewGroup(huh.NewInput().Title("Wait a few seconds without typing").Value(&s)))
      if err := f.Run(); err != nil {
              fmt.Println("err:", err)
      }
      fmt.Println("value:", s)
}

Steps:
1. Build and run the program in iTerm2.
2. Do not press any key for 4-5 seconds.
3. Press Enter to submit and exit.
4. Capture raw output via script -q out.log ./binary while doing the above.

Expected behavior

Cursor should visibly blink (alternate reverse-video rendering) every ~530ms while the field is focused and idle, producing periodic redraw frames in the captured output.

Actual behavior

Only the initial frame is ever written. Diffing the captured session shows:
- One full render right after Init() (title, prompt, cursor block with \x1b[38;2;R;G;B;7m — the ;7 confirming the "visible" reverse-video state is drawn once).
- Zero additional frames for the entire idle window (verified over 4-5s, no \x1b[7m/reverse toggling repeats).
- Then the standard exit sequence (\x1b[?2026l, \x1b[?25h, \x1b[?2004l, \x1b[?1004l, ...) on submit.

This means the blink timer/command (cursor.Model.Blink() → BlinkMsg after BlinkSpeed) never re-enters the Bubble Tea event loop — this is a functional issue (missing redraw), not just a
terminal rendering/visibility quirk.

### Version

- charm.land/huh/v2: v2.0.3   - Tried both:     - charm.land/bubbletea/v2 v2.0.2 + charm.land/bubbles/v2 v2.0.0 (original pinned versions) — bug present     - charm.land/bubbletea/v2 v2.0.8 + charm.land/bubbles/v2 v2.1.1 (latest at time of testing) — bug still present

### Environment

- OS: macOS (Darwin 25.5.0, arm64)   - Go: go1.26.4 darwin/arm64   - Terminal: iTerm2 Build 3.6.4   - TERM=xterm-256color (also reproduced with TERM=xterm override — no change)