feat: Add "Neon Sketch" drawing tool and improve UI

[Josephaswisher]

This commit introduces a new "Neon Sketch" drawing tool that allows the Gemini agent to create and display drawings in the user interface.

Key changes include:

• Drawing Tool Integration: Added a drawing tool to the Gemini agent, enabling it to interpret natural language commands and generate drawing instructions.
• DrawingPadApp Component: Implemented a DrawingPadApp component that can render drawings based on commands received from the agent.
• Improved User Feedback: Added a loading indicator to the command input to provide visual feedback when the agent is processing a request.
• Refined Error Handling: Implemented a more informative error window that displays the failed command and error message.

TLDR

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Reviewer Test Plan

Testing Matrix

	🍏	🪟	🐧
npm run	❓	❓	❓
npx	❓	❓	❓
Docker	❓	❓	❓
Podman	❓	-	-
Seatbelt	❓	-	-

Linked issues / bugs

[Copilot]

Pull Request Overview

This PR introduces a "Neon Sketch" drawing tool that enables the Gemini agent to create and display drawings through natural language commands. The implementation includes a refactored drawing component with programmatic command support, improved UI feedback during command processing, and enhanced error reporting.

Key Changes

• Added drawing tool integration to the Gemini agent with JSON schema for shape commands (line, circle, rectangle)
• Refactored DrawingPadApp to support rendering from programmatic drawing commands while maintaining interactive drawing capabilities
• Enhanced user feedback with loading indicators and detailed error windows

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
runtime/backend/gemini-agent.js	Added drawing tool configuration to Gemini agent with command schema
runtime/frontend/src/App.tsx	Integrated drawing command parsing and error window creation
runtime/frontend/src/App.css	Added error window styling
runtime/frontend/src/components/DrawingPadApp.tsx	Refactored to support both interactive and programmatic drawing with neon theme
runtime/frontend/src/components/DrawingPadApp.css	Updated styling to match neon aesthetic
runtime/frontend/src/components/CommandInput.tsx	Added loading indicator for pending commands
runtime/frontend/src/components/CommandInput.css	Added loading indicator animation styles

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