feat: render inline code spans verbatim in the Org buffer

A fetched description with markdown inside backticks — `**bold**`, `[text](url)`, `_italic_` — got its span contents converted along with the surrounding prose, so the Org buffer showed `*bold*` and `[[url][text]]` inside what should read as literal code. Markdown treats a code span as opaque; the converter didn't.

Both converters now tokenize code spans first and apply link/bold/italic conversion only to the text between them, keeping span contents literal. The md->org and org->md directions each split into an emphasis-only helper (pearl--md-emphasis-to-org, pearl--org-emphasis-to-md) called on the gaps, with the span passed through untouched. Keeping the split symmetric is what preserves the round-trip identity a fetch + no-edit push depends on.

A new test asserts the verbatim rendering for bold, link, and italic inside a span, plus emphasis still converting outside one and between two spans.

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