Fix line-start dash rendering in status content

[Dimillian]

Motivation

• Status content that begins lines with - , * or + was being interpreted as Markdown list markers and rendered as list items instead of literal text.
• The HTML-to-markdown conversion in HTMLString must preserve literal leading list markers when they appear at the start of a line in the original content.

Description

• Update Packages/Models/Sources/Models/Alias/HTMLString.swift to detect line starts when handling #text nodes and escape leading list markers by prefixing them with a backslash so they render as literal characters.
• The check treats a line start as when asMarkdown is empty or ends with a newline and escapes markers matching - , * or + .
• Add a regression test testHTMLStringInit_lineStartListMarkers in Packages/Models/Tests/ModelsTests/HTMLStringTests.swift that verifies a <br />- sequence is preserved as \- in asMarkdown.

Testing

• Added unit test testHTMLStringInit_lineStartListMarkers to cover the regression scenario and ensure literal leading markers are escaped.
• No automated test suite was executed in this environment (xcodebuild / swift test not run here).

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Codex Task

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Note

Prevents accidental list rendering when status text starts with list-like markers.

• Update HTMLString.handleNode(#text) to detect line starts (empty output or after \n) and prefix leading - , * , + with a backslash before appending to asMarkdown
• Add testHTMLStringInit_lineStartListMarkers verifying <br />- becomes \- in asMarkdown while asRawText remains unchanged

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