fix(cli): render content in promptSelect when terminal height is too small

[crowlKats]

Problem

promptSelect() (and promptMultipleSelect(), which share handlePromptSelect) could render only a scroll indicator (...) with no selectable content when there wasn't enough vertical space.

This happens whenever the available terminal height is 0 or negative — e.g. a small terminal, or fitToRemainingHeight: true with the cursor near the bottom of the screen. availableHeight = rows - SAFE_PADDING(4) becomes ≤ 0, which collapses visibleLines to 0, so no items are sliced into the visible window and only the "more content" indicator is printed.

Reproduction (80×4 terminal):

Please select a browser:
  ...

Fix

Clamp visibleLines to at least 1 in both places it is computed, so at least one item is always visible:

Please select a browser:
❯ safari
  ...

Tests

Added promptSelect() always shows at least one item when height is too small, which stubs a 4-row terminal and asserts the active item is rendered. All existing promptSelect/promptMultipleSelect tests still pass.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.84%. Comparing base (cdf74a8) to head (ab1c486).
⚠️ Report is 18 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7209      +/-   ##
==========================================
+ Coverage   94.57%   94.84%   +0.26%     
==========================================
  Files         636      616      -20     
  Lines       52142    51419     -723     
  Branches     9401     9300     -101     
==========================================
- Hits        49315    48766     -549     
+ Misses       2249     2112     -137     
+ Partials      578      541      -37     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.