#9624 - Refactor: Variables are missing in props validation (let's rewrite JS to TS) 42

[mariam-khutuashvili]

How the feature works? / How did you fix the issue?

(Screenshots, videos, or GIFs, if applicable)

• Convert refrag.js to TypeScript (.ts) with full type definitions
• Add typed class field item: Fragment and typed constructor parameter
• Type all method parameters using existing Render, ReStruct, Fragment, and Box2Abs types
• Add optional chaining for Map.get() calls to handle potential undefined
• No any used — all types are explicit

Check list

• unit-tests written
• e2e-tests written
• documentation updated
• PR name follows the pattern #1234 – issue name
• branch name doesn't contain '#'
• PR is linked with the issue
• base branch (master or release/xx) is correct
• task status changed to "Code review"
• reviewers are notified about the pull request