TIKA-4966: apply font formatting styles in docx

[tballison]

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[Copilot]

🟡 Changes recommended

Style inheritance currently implements OOXML toggle properties incorrectly, and style-class normalization has a Unicode edge case.

3 open findings

• Lowercase before sanitizing and cap Unicode length safely · New
• Fix OOXML bold toggle inheritance semantics · New
• Correct release note issue ID from TIKA-4966 to TIKA-4996 · New

What changed in this PR

Adds DOCX character-style formatting and optional XHTML style classes.

Changes:

• Resolves bold/italic character styles and inheritance.
• Adds configurable <span> classes with sanitized names.
• Adds regression fixtures and tests.

File	Description
CHANGES.txt	Documents the feature.
WordExtractor.java	Sanitizes style class names.
OfficeParserConfig.java	Adds the character-style class option.
FormattingTagManager.java	Manages style spans.
OOXMLTikaBodyPartHandler.java	Applies effective run styles.
OOXMLWordAndPowerPointTextHandler.java	Parses run style references.
RunProperties.java	Tracks direct/style formatting state.
XWPFStylesShim.java	Parses and resolves style inheritance.
WordParserTest.java	Tests class-name conversion.
OOXMLDocxSAXTest.java	Tests character-style XHTML output.

🧠 Review effort: Balanced

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