fix(mobile): extend blockquotes across wrapped lines - #6482

Note

Low Risk
Mobile-only markdown presentation and prop threading; no auth, data, or API changes.

Overview
Plain blockquotes on iOS now use the rich markdown path (containsRichBlock includes blockquote) so they render via NativeMarkdownBlock’s left border instead of a │ character in selectable text—fixing markers that disappeared after the first wrapped line.

skills is threaded through NativeMarkdownBlock and nested renderers, and selectable/table text uses nativeMarkdownDocumentRuns (with skills) instead of nativeMarkdownTextRuns, so $skill decoration still works inside blockquotes and table cells. Regression tests cover rich blockquote chunking and skills in quotes.

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Note

Fix blockquote rendering to extend across wrapped lines on mobile

• Adds node.type === "blockquote" to containsRichBlock in nativeMarkdownText.ts, routing blockquotes through the rich rendering path so they render correctly across line wraps.
• Propagates a skills array through NativeMarkdownBlock and all child components (SelectableNode, NativeTable, NativeMarkdownImage, NativeMixedParagraph, NativeList) so skill-link decoration applies inside rich blocks including blockquotes.
• Replaces nativeMarkdownTextRuns with nativeMarkdownDocumentRuns in table cells and selectable nodes to support skill decoration.
• Behavioral Change: NativeMarkdownBlock now requires a skills prop; callers must pass it.

^{Macroscope summarized d0a24be.}