Add Web Serial transport path to ESP3D UI for direct USB machine control

[Copilot]

• Check current CI/workflow status and any failures for this branch
• Locate the best documentation location for Web Serial setup instructions
• Add concise setup instructions for USB serial transport, including screenshot references
• Validate no trailing whitespace and run targeted build/tests as needed
• Reply to the PR comment with commit hash and screenshot details

[davidelang]

@MaslowBot will this catch things like crashdumps sent over the USB serial port?

[MaslowBot]

@copilot-swe-agent

User @davidelang mentioned @MaslowBot with the following request:

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@MaslowBot will this catch things like crashdumps sent over the USB serial port?

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This comment was automatically relayed by MaslowBot so that @copilot-swe-agent can respond to the request.

[Copilot]

@copilot-swe-agent

User @davidelang mentioned @MaslowBot with the following request:...

Yes—text crash dumps sent over USB serial will be captured and shown in the monitor path, because every incoming serial line is processed through the same message pipeline (not just ok/error responses). The only caveat is that data is line-buffered, so non-newline-terminated/binary fragments may not appear until a newline arrives. UI screenshot of the USB serial option: /tmp/usb-serial-ui.png.

[davidelang]

@MaslowBot add instructions (with screenshots if possible) to show how to set this up

[MaslowBot]

@copilot-swe-agent

User @davidelang mentioned @MaslowBot with the following request:

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@MaslowBot add instructions (with screenshots if possible) to show how to set this up

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This comment was automatically relayed by MaslowBot so that @copilot-swe-agent can respond to the request.

[davidelang]

@MaslowBot /build

[github-actions]

🤖 Firmware & Web UI Compilation Complete 🤖

✅ Successfully compiled FluidNC firmware and ESP3D-WEBUI

Firmware Build Details:

• Commit: 0837736ce7a10b30ef1bcc19ed0e79389806983b
• Version: v1.21-85-g0837736c-dirty
• Environment: wifi_s3 (ESP32-S3)
• Firmware size: 1.90 MB
• Flash usage: 1.90 MB (64.7%)
• RAM usage: 136.1 KB (42.5%)

Web UI Build Details:

• Language: English only
• WebUI size: 142.98 KB (compressed)
• Format: index.html.gz

Download:
The firmware package (containing firmware.bin, index.html.gz, and installation instructions) has been uploaded as a build artifact named "firmware-package" and can be downloaded from the Actions tab.

To test this release please:
[] Try running calibration with a fresh maslow.yaml file
[] Test jogging the machine to see that movements are normal
[] Try running a simple gcode file

This comment was automatically generated in response to a build request comment.

[Copilot]

@copilot-swe-agent

User @davidelang mentioned @MaslowBot with the following request:...

Added setup instructions to ESP3D-WEBUI/README.md (steps for USB cable, browser support, connect dialog, port selection, and handshake), plus an embedded screenshot at ESP3D-WEBUI/images/usb-serial-setup.png. Included in commit f91070f2.