Implement formatter

[ArtyomVancyan]

• Introduced a new Formatter class in langgraphics/formatter.py to provide standardized serialization and normalization of node inputs and outputs, replacing the previous ad-hoc message preview logic. This ensures consistent formatting and easier downstream consumption.
• Updated langgraphics/streamer.py to use the new Formatter for serializing node inputs and outputs, removing the old preview and parse_message functions, and simplifying error handling.
• Parse and display system, input, and output messages as structured objects, including rendering a message content as markdown using the new react-markdown dependency.

[Copilot]

Pull request overview

This pull request introduces a new Formatter class to standardize serialization and normalization of node inputs and outputs in the langgraphics visualization tool. The PR replaces ad-hoc message preview logic with a more structured approach and adds markdown rendering capabilities for better UI presentation.

Changes:

• Introduced Formatter class in langgraphics/formatter.py with methods for serializing and normalizing Run objects
• Updated langgraphics/streamer.py to use the new Formatter instead of old preview and parse_message functions
• Enhanced the web UI to parse and display messages as structured objects with markdown rendering using react-markdown

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 19 comments.

Show a summary per file

File	Description
pyproject.toml	Version bump from 0.1.0-beta.1 to 0.1.0-beta.2
langgraphics/formatter.py	New file implementing Formatter class with serialization and normalization logic for different run types
langgraphics/streamer.py	Refactored to use Formatter.inputs() and Formatter.outputs() methods, removing old helper functions
langgraphics-web/src/index.css	Added new CSS variables and styling for tags, borders, and role-specific coloring; moved margin/padding rules
langgraphics-web/src/components/InspectPanel.tsx	Added ReactMarkdown integration and structured parsing of system/input/output messages with role-based rendering
langgraphics-web/package.json	Added react-markdown@^10.1.0 dependency

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