fix: (continuation) Remove Extra Space Before and After Group Items

[wanadzhar913]

Details

This is a continuation of the work in Pull Request: #458

which emoves extra space before and after group items to resolve the issue raised in #2745

Resolves #371
Resolves docling-project/docling#2745

Approach

Refactors inline spacing in docling_core/transforms/serializer/common.py into a clearer decision flow centered on _classify_inline_boundary().

_join_inline_parts() is the entry point. It walks adjacent inline chunks, calls _classify_inline_boundary() for each boundary condition, and inserts a space only when that classifier returns InlineBoundary.SPACE.

[mergify]

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[github-actions]

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[wanadzhar913]

Closing due to DCO check failure.