fix(core): guard MarkdownRenderable.getStyle against undefined syntaxStyle

[cevr]

Summary

• Guards MarkdownRenderable.getStyle() against _syntaxStyle being undefined when the Solid reconciler sets content before syntaxStyle

Problem

The @opentui/solid reconciler creates elements with new Element(ctx, { id }) — only { id } is passed in constructor options. Props are then applied via setters in JSX declaration order.

When a consumer writes:

<markdown content={props.content} syntaxStyle={props.syntaxStyle()} ... />

The content setter fires first, triggering updateBlocks() → createChunk() → getStyle(), which accesses this._syntaxStyle — still undefined because the syntaxStyle setter hasn't run yet.

This crashes with:

TypeError: undefined is not an object (evaluating 'this._syntaxStyle.getStyle')

Note

There's an existing branch fix(solid)-prop-initialization-before-insert that attempts to fix this at the Solid/babel level. This PR takes a complementary approach — defensive guard in MarkdownRenderable itself, so the component is resilient regardless of prop order.

Fix

• Early-return undefined from getStyle() when _syntaxStyle is uninitialized
• Blocks render unstyled initially; once syntaxStyle setter runs, _styleDirty triggers rerenderBlocks() on the next render cycle with correct styles

Test plan

• Verified fix resolves the crash in gent TUI (streaming markdown with <markdown content={...} syntaxStyle={...} />)
• TypeScript compiles clean (no new errors in Markdown.ts)
• Visual: markdown renders with correct syntax highlighting after initial unstyled frame

🤖 Generated with Claude Code

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commit: 3aea717