[raphaelcoeffic]

Summary of changes:

Based on #7964, as the build info moved here is added there. Merge that first, then this one targets main.

The LCD canvas had a fixed height, while its width was limited to the space available. Any LCD wider than that space got stretched vertically: the TX16S MK3 was 631x480 on every desktop window size, and all radios were affected on a phone.

• Aspect ratio: the height now follows from the width.
• TX16S MK3 size: it is shown 582x349 rather than 800x480. Its LCD is only a little larger than a 480x272 one, with a higher density. The scale of 1.375 is the firmware's LAYOUT_SCALE for this LCD, which makes the UI the same size on the page as on other radios. Smooth scaling replaces pixelated here, as the scale isn't a whole number. Every other radio keeps its current width on desktop.
• Build info: the commit and date move from the header to a footer below the trace output, where they draw less attention.

Testing

Tested on top of #7964, as 25 radios, including the MK3, cannot start on main without it.

• The LCD ratio of all 47 radios at 1920, 1280, 1000 and 390 pixels wide: 50 wrong before, none after.
• The smoke test from ci(web): publish the web simulator to Cloudflare Workers #7964 passes on all 47 radios, with all of these changes.
• The footer shows below the radio at 1280 and 390 pixels wide, and no longer in the header.

Not changed: the page is still wider than a phone screen, and the LCD is small there. Touch input was not exercised, though it already scales positions by the displayed size of the canvas.