Document larger text accessibility APIs

[shai-almog]

Motivation

• Document how Codename One responds to the OS larger-text accessibility setting and how to consume that information in apps.
• Explain how the theme system can automatically apply the larger-text scale so developers can enable it without manual font adjustments.
• Surface the useLargerTextScaleBool theme constant so designers can enable the behavior from the Designer or theme file.

Description

• Added a new Larger Text Accessibility section to docs/developer-guide/Miscellaneous-Features.asciidoc explaining Display.isLargerTextEnabled() and Display.getLargerTextScale() with a usage example.
• Documented how to enable automatic scaling via UIManager.getInstance().setUseLargerTextScale(true) and the theme constant useLargerTextScaleBool.
• Added a useLargerTextScaleBool entry to the theme constants table in docs/developer-guide/Advanced-Theming.asciidoc.

Testing

• No automated tests were run because this is a documentation-only change.
• No code behavior was modified, so unit test suites were not invoked as part of this update.

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Codex Task

[github-actions]

Developer Guide build artifacts are available for download from this workflow run:

• Developer Guide HTML package
• Developer Guide PDF
• AsciiDoc linter report
• Vale report
• Unused image report

Developer Guide quality checks:

• AsciiDoc linter: No issues found (report)
• Vale: 18764 alert(s) (2764 errors, 6366 warnings, 9634 suggestions) (exit code 1) (report)
• Image references: No unused images detected (report)