Add web installer for ESP32 firmware

[ZegesMenden]

Summary

• add a landing page with UI controls for connecting to an ESP32 board, choosing panel size, and flashing firmware
• load esptool-js in the browser to detect the connected chip, download the matching binary, and program the device
• provide modern styling and a live activity log to guide the user through connection, flashing, and disconnect operations

Testing

• not run (UI-only change)

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https://chatgpt.com/codex/tasks/task_e_68f7c3a3ab9483268d9b617806344891

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Ensure disconnect runs after connection failure

The catch block in connectToDevice calls disconnectDevice() while state.busy is still true from the earlier setBusy(true). Because disconnectDevice immediately returns when state.busy is true, any failure that occurs after the serial port is opened leaves the port and UI state untouched, so the device remains connected and the user cannot reconnect without reloading. Clear the busy flag (or provide a cleanup path that bypasses the guard) before invoking disconnectDevice so resources are always released on error.

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[chatgpt-codex-connector]

Pass flash options object to esptool loader.flash

In flashBinary, the code constructs flashOptions containing fileArray but then invokes loader.flash(files, flashOptions). esptool-js v0.9.x expects a single options object (loader.flash({ fileArray, ... })); supplying two positional arguments means the first parameter is an array without the expected properties and the call will reject before any data is written. As a result, flashing fails on builds that expose loader.flash. Pass the constructed options object directly instead of separating the array and options into two parameters.

Useful? React with 👍 / 👎.