feat: localize selection menu labels via selectionMenuLabels prop

[marcellov7]

Summary

Closes #198.

The built-in copy actions (Copy, Copy as Markdown, Copy Image URL) are hardcoded in English in the native code. On non-English apps they stay in English while the OS-provided menu items (Look Up, Translate…) are localized, creating an inconsistent menu — exactly the problem reported in #198.

This adds a selectionMenuLabels prop on EnrichedMarkdownText so the labels can be overridden from JS (option 2 in the issue), typically wired to the app's i18n:

<EnrichedMarkdownText
  markdown={content}
  selectionMenuLabels={{
    copy: t('copy'),
    copyAsMarkdown: t('copyAsMarkdown'),
    copyImageUrl: t('copyImageUrl'),
    copyImageUrls: t('copyImageUrls'), // "{count}" is replaced by the image count
  }}
/>

Any label left undefined keeps its English default, so the change is fully backward compatible.

How it works

The labels are folded into the existing selectionMenuConfig codegen struct (normalized JS-side, where an empty string means "use the native default"), so no new native prop plumbing is introduced.

• TS — new SelectionMenuLabels type + prop; normalization in native/EnrichedMarkdownText.tsx; struct fields added to both text/github codegen specs.
• Android — labels read in MarkdownViewManagerUtils, applied in SelectionActionMode and threaded to the table and math copy menus.
• iOS / macOS — labels carried on ENRMSelectionMenuConfig (strong owners on the view) and applied in EditMenuUtils(+macOS) and the TableContainerView / ENRMMathContainerView menus.

Scope

Covers EnrichedMarkdownText (commonmark + github flavor), including the table and math block copy menus listed in #198. EnrichedMarkdownTextInput keeps only its visibility config for now (the Format submenu labels could be a follow-up).

Notes for reviewers

• Docs updated: docs/COPY_OPTIONS.md (new "Localizing Menu Labels" section) and docs/API_REFERENCE.md.
• yarn typecheck and eslint pass locally. I couldn't run the native (Xcode/Gradle) builds or clang-format/ktlint in my environment, so please double-check the native formatting matches the hooks — happy to adjust.
• No public API removed; existing behavior is unchanged when the prop is omitted.

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