OpenSystemsDevelopment / qpdf

Improve null key/value handling in `NNTree`, add checks across insert…

Fixes bug in #1523

Validate existence of array items in `NNTree`, improve null handling,…

Fixes bug in #1523

Refactor private API class Array

… checking, and align with `Array` API conventions.

…prove bounds checking

…y, modify bounds checks, and adjust affected tests.

… to use subscript operators, and simplify object access logic.

…bounds checks with subscript operator, simplify loop logic, and remove redundant trace.

…hecks with `Array` subscript operator, simplify logic, and improve null handling.

…rray`, use subscript operators, simplify logic, and improve readability.

…s`, remove redundant trace, and improve null handling.

…move redundant trace, and improve readability.

…reamline object assignment, and introduce constructors for `QPDFObjectHandle`.

Add private-API subscript operators to `QPDFObjectHandle`

…tem` with `size` and subscript operators, simplify logic, and improve error handling.

…ems` and `getArrayItem` with `size` and subscript operators, and improve code readability.

…ms` and `getArrayItem` with `size` and subscript operators, remove redundant debug traces, and improve readability.

…em` with `size` and subscript operators, remove redundant debug traces, simplify loop logic, and improve readability.

…` and subscript operators, remove redundant debug traces, and improve code readability.

…eplace `getArrayNItems` with `size`, and improve error handling logic.

…Items` with subscript operators, introduce `std::cmp` utilities, and remove redundant debug traces.

…logic, and replace redundant code with subscript operators.

…lify `withinLimits` logic, and improve code readability with subscript operators.

…` and `getArrayNItems` with subscript operators for readability and cleaner syntax.

…edundant debug traces.

…and improve `findInternal` readability.

Implement subscript operators (`operator[]`) to provide indexed access to `QPDFObjectHandle` for both `size_t` and `int` types.

Add error handling for missing or invalid Resources and invalid or du…

…otations in page objects

- Repair invalid or missing Resources in page object trees with warnings
- Remove invalid Annots arrays with warnings
- Warn about duplicate annotations
- Update test cases and output to reflect new error handling.
- Improve robustness for annotation and resource validation.

Refactor QPDF::ResolveRecorder

…`, and simplify member access.

Remove temporary file accidentally included in #1518