fix: use checkbox markers in tool multiselect

[leno23]

Summary

• render the searchable multi-select prompt with [x] and [ ] markers instead of radio-style circles
• add coverage that verifies selected and unselected options use checkbox-style markers

Why

The init tool selector supports multiple selections, but circular markers make it look like a radio-button single-select control.

Fixes #647.

Validation

• pnpm exec vitest run test/prompts/searchable-multi-select.test.ts

Summary by CodeRabbit

• Style
  • Updated visual indicators in multi-select selection lists: selected items now display with a checkmark [x] and unselected items display with an empty box [ ] for improved clarity.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 879f36ab-71c4-42c2-be3b-78f017cae162

📥 Commits

Reviewing files that changed from the base of the PR and between 1b06fdd and eb3e94c.

📒 Files selected for processing (2)

• src/prompts/searchable-multi-select.ts
• test/prompts/searchable-multi-select.test.ts

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📝 Walkthrough

Walkthrough

This PR updates the multi-select prompt UI to use checkbox-style indicators ([x] and [ ]) instead of radio-button-style symbols (◉ and ○), aligning the visual representation with the multi-selection capability. A test suite validates the checkbox markers render and toggle correctly.

Changes

Checkbox Visual Update

Layer / File(s)	Summary
Checkbox rendering and test validation src/prompts/searchable-multi-select.ts, test/prompts/searchable-multi-select.test.ts	Selection icon changed from radio buttons to checkbox markers with chalk styling ([x] for selected, [ ] for unselected). New test suite verifies checkbox markers render initially unchecked and update to checked after toggling selection via space key.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

A rabbit hops through checkboxes with glee,
No more radio buttons confusing the spree,
[x] marks the spot where selections align,
Multi-select clarity, now that's divine! ✓

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: updating the searchable multi-select prompt to use checkbox markers instead of radio-style indicators.
Linked Issues check	✅ Passed	The PR successfully implements the objective from #647: changing visual markers from radio-button style (◉/○) to checkbox style ([x]/[ ]) in the searchable multi-select prompt, matching visual affordance to multi-selection behavior.
Out of Scope Changes check	✅ Passed	All changes are directly in-scope: modifications to the searchable-multi-select.ts prompt file and corresponding test coverage align exactly with the requirements in issue #647.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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