fix(tui): blockquote multiline rendering and wrapping

[ferologics]

Fix two bugs in blockquote rendering:

1. ANSI codes split incorrectly on newlines - when text tokens contain newlines, styling was applied to the entire string including the newline. Any caller splitting by \n would break the ANSI codes, causing inconsistent coloring (e.g., first line pink, second line grey).

2. Wrapped blockquote lines lost the │ border - long blockquote lines that wrapped to multiple lines only had the border on the first line.

Solution

Refactored renderInlineTokens to use a style context instead of a boolean flag:

interface InlineStyleContext {
  applyText: (text: string) => string;
  stylePrefix: string;
}

• Default context uses applyDefaultStyle() for normal text
• Blockquotes pass a quote style context with theme.quote(theme.italic(text))
• Inline formatting resets (bold, code, etc.) properly re-apply the base style via stylePrefix
• Text is split by newlines before styling to ensure ANSI codes don't span line breaks

Also added handling for paragraph tokens inside renderInlineTokens - these appear in blockquotes and need to propagate the style context to their nested inline tokens.

Tests

Added regression tests for:

• Lazy continuation blockquotes (>Foo\nbar)
• Explicit multiline blockquotes (>Foo\n>bar)
• Long blockquote line wrapping with border on each line
• Inline formatting inside blockquotes (> Quote with **bold** and \code``)

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Session: https://buildwithpi.ai/session/#95f37a58d17decb975c4d57085737421