Allow sending of CTRL-C and CTRL-D

[cgreening]

Summary

Adds buttons for sending CTRL-C and CTRL-D

Motivation & Context

Closes #13

Changes

Adds buttons for sending these codes

Screenshots / Demos (if UI)

How to Test

1. Connect to serial
2. Try the new buttons

Checklist

• I ran npm run lint and fixed any issues
• I ran npm run typecheck (TypeScript) with no errors
• I ran npm test and tests pass
• I ran npm run test:coverage if code paths changed significantly
• I added/updated tests where appropriate
• I updated docs/README if needed
• No breaking changes without clear migration notes

Additional Notes

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	web-serial-plotter	9428dab	Commit Preview URL Branch Preview URL	Oct 01 2025, 09:39 PM

[Copilot]

Pull Request Overview

This PR adds support for sending CTRL-C and CTRL-D control characters in the serial console interface. It introduces both keyboard shortcuts and dedicated UI buttons for these commonly used terminal control commands.

• Adds keyboard shortcuts (Ctrl-C and Ctrl-D) that are intercepted and sent as control characters
• Implements UI buttons for sending CTRL-C (interrupt) and CTRL-D (EOF) commands
• Updates message handling logic to properly format and log control characters

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/components/SerialConsole.tsx	Updates message handling to detect and properly format control characters without adding newlines
src/components/ConsoleInput.tsx	Adds keyboard event handling, control character buttons, and updated placeholder text

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[Copilot]

The control character name generation logic uses a magic number (64) without explanation. Consider adding a comment explaining that this converts ASCII control codes to their corresponding caret notation (e.g., code 3 becomes '^C' via String.fromCharCode(64 + 3) = '@' + 3 = 'C').

Suggested change

	const code = message.charCodeAt(0)
	const code = message.charCodeAt(0)
	// The magic number 64 converts ASCII control codes to caret notation (e.g., code 3 becomes '^C' via String.fromCharCode(64 + 3) = 'C')