fix(workflow): correct loop boolean break condition values

[HelloSrauker]

Summary

• store new Loop Boolean break-condition defaults as actual booleans
• keep Boolean values typed when switching an existing condition to a Boolean variable
• normalize legacy "true" / "false" values before rendering the Boolean selector
• add regression tests for legacy rendering and Boolean variable selection

Fixes #41185

Screenshots

N/A. The behavior is covered by focused regression tests.

Checklist

• This change requires a documentation update, included: N/A; no documentation change is required.
• I understand that this PR may be closed in case there was no previous discussion or issues.
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly. N/A; no documentation change is required.
• I ran make lint && make type-check (backend) and vp staged (frontend) to appease the lint gods.

Verification

• Loop unit suite: 9 files, 33 tests passed
• Web TypeScript check: passed
• Formatting check: all 4 changed files are correctly formatted
• Focused vp check: reports 2 pre-existing a11y errors and 3 pre-existing icon warnings on untouched lines in condition-item.tsx; no out-of-scope auto-fix was applied

From Codex