OpenSystemsDevelopment / qpdf

… shared helper retrieval, validation methods, and update usages across the codebase. Remove unused test coverage entries.

…t. Add shared helper retrieval, validation methods, and update usages across the codebase.

…le handling. Add shared helper retrieval, validation methods, and update usages across the codebase.

Integrate `QPDFPageLabelDocumentHelper` with `QPDF` for improved page label handling. Add methods for retrieving shared helper instances, validating page label structures, and streamline usage throughout the codebase.

Create new private-API class Name

…or improved clarity and consistency, and remove unused test coverage entries.

… operator[] and `Name` for improved clarity and consistency, and remove unused test coverage entries.

…, and `Array` for improved clarity and consistency, and simplify `/Filter` and `/DecodeParms` handling.

…DecodeParms` using `Name`, `Dictionary`, and `Array` for improved clarity and consistency, and remove unused test coverage entries.

…tor[] for improved clarity and consistency, and remove unused test coverage entries.

…ame` for improved clarity and consistency, and simplify `/Identity` handling.

…ator[] for improved consistency and clarity, and remove unused test coverage entry.

…`Dictionary` and `Name` for improved clarity and consistency, and streamline `/Resources` and `/Font` handling.

…s for improved clarity and consistency.

Refactor `NNTreeImpl::repair`…

…a map during the first pass, add custom comparator for sorting keys.

Refactor QPDFAcroFormDocumentHelper::transformAnnotations

… redundant `initialized_dr_map` flag and directly checking `dr`.

…g with `Dictionary` and `Array`.

… with `std::deque` in `traverse_field` for better performance and simplify traversal logic.

…ield` function to increase code clarity.

…h `std::list<Dictionary>`, simplify `/Kids` handling, and update method calls for consistency.

…annotation` to increase code clarity.

…h operator[], update type handling for clarity and consistency, and streamline resource merging.

Add new private-API class Integer

…ndling, replace `QPDFObjectHandle` with direct type usage, and remove redundant `QTC::TC` calls.

…, remove redundant `QTC::TC` call, and simplify type usage.

…e handling to improve clarity and consistency.

Refactor: consolidate `field_to_annotations` and `field_to_name` maps…

…roFormDocumentHelper`, replace redundant maps with `FieldData` encapsulation.

Replace calls to `isNull`with calls to `null`

…n `QPDFWriter` and `QPDFJob`.

…eamFilter`, include necessary private headers.

…n `QPDFPageDocumentHelper`, `QPDFPageObjectHelper` and `QPDFPageLabelDocumentHelper`.

…n `QPDFOutlineObjectHelper` and `QPDFOutlineDocumentHelper`.

…s in `QPDFFormFieldObjectHelper`.

…n `QPDFAcroFormDocumentHelper`.