0xbyt4 5cdcb9e26f fix: strip MarkdownV2 italic markers in Telegram plaintext fallback ...

When MarkdownV2 parsing fails, _strip_mdv2() removes escape backslashes
and bold markers (*text*) but missed italic markers (_text_). Users saw
raw underscores around italic text in the plaintext fallback.

- Add regex to strip _text_ italic markers in _strip_mdv2()
- Use word boundary lookaround to preserve snake_case identifiers
- Add tests for _strip_mdv2 covering italic, bold, snake_case, and edge cases

2026-03-07 18:55:25 +03:00

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