[hryhoriiK97]

What/Why?

Copying a table loses two things: HTML export writes cell line separators through as whitespace, which receiving apps collapse, and Copy as Markdown drops the $…$ around inline equations. The HTML escapers now emit <br> for line separators outside code blocks, with CRLF as one break, and both markdown serializers emit LatexMathInline with its delimiters.

This carries @Yash-Singh1's #995 (3be6e76, here 8d688af) unchanged as the first commit, rebased onto current main, plus one follow-up. #995 comes from an organization-owned fork, which GitHub does not let maintainers push to, so the follow-up lands here. #995 stays open for the discussion there and closes when this merges; both commits keep their authorship.

Closes #992.

Follow-up commit on top of #995

• iOS collectParagraphsData split blocks with lineRangeForRange:, which treats the U+2028 a hard break renders as like a paragraph end. A paragraph with a hard break already exported as two <p> blocks and a list item as two <li> items, and with the new <br> escaping the first half gained a trailing <br>. It now splits with paragraphRangeForRange:, so the break stays inside its block and comes out as <p>line one<br>line two</p>. Android renders hard breaks as \n, which its splitter also treats as a block end, so this PR does not change Android's hard-break export; that needs a marker on the break and is separate work.
• Tests are named by feature like fix: size ordered list markers to their widest number #1015: ClipboardExportTests.mm and ClipboardExportTest.kt, since both cover HTML and Markdown export. Added on top of the PR's cases: a rendered hard-break paragraph and list item on iOS, the code block gate on Android, a run mixing escaped characters with a line break, and math nested in strong, on both platforms. The Android style map gained the spoiler, superscript and subscript entries the renderer resolves eagerly.

Notes

• Table cells cannot hold a line break from markdown today: <br> stays literal with HTML spans disabled and a backslash break ends the row. Once fix(parser): preserve named and numeric character references #1018 merges, | a
b | decodes to a real newline in the cell and this PR's escaper is what turns it into <br>, so the separator cases are the right coverage for that. A rendered end-to-end case through the parser is worth adding after fix(parser): preserve named and numeric character references #1018.
• Spoiler is missing from both markdown serializers in the same way math was, so ||x|| in a cell also loses its delimiters on Copy as Markdown. Left for a separate change.

Testing

• Example app's iOS unit-test target on iPhone 17 / iOS 26.5: 12 tests green, 5 in this suite.
• RN Android Robolectric ClipboardExportTest through the example's Gradle host: 4 tests green.
• clang-format, ktlint and commitlint pass via the commit hooks.

PR Checklist

• Code compiles and runs on iOS
• Code compiles and runs on Android
• Updated documentation/README if applicable, no public API change
• Ran example app to verify changes
• E2E tests are passing
• Required E2E tests have been added, unit tests cover the exporters; no Maestro flow exercises table copy yet

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