#11901 - rewrite packages\ketcher-core\src\application\editor\shared\closest.js from javascript to typescript

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Converted closest.js to TypeScript with proper type definitions. Here's what was done:

1. Created Type Definitions File (closest.types.ts)
   Created closest.types.ts with the following exported types:

• ClosestAtom - Result interface with id: number and dist: number
• ClosestSkipItem - Skip item interface with map: 'atoms' and id: number
• FindClosestAtom - Function type for the main search function
• ClosestModule - Export interface for the module

2. Converted to TypeScript (closest.ts)
   Created closest.ts with:

Type Conversions:

• restruct: ReStruct - The render structure type
• pos: Vec2 - Vector position type
• skip: ClosestSkipItem | null - Skip item or null (no implicit any)
• minDist: number | null - Minimum distance or null
• closestAtom: number | null - Atom ID or null
• Return type: ClosestAtom | null - Explicit return type

Key Improvements:

• All function parameters are explicitly typed
• All variables have resolved types (no any types)
• Added JSDoc comments for better documentation
• Proper type safety with strict TypeScript compiler

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