add 1024x576 as an intermediate GUI resolution for smaller screens

[levkropp]

Some Macbooks and other small laptops have resolutions such as 1440x900 or 1366x768 that are below the threshold for the "large" GUI resolution of 1400x822's minimum screen size of 1600x900, but the default (minimum) of 750x450 is too small.

This PR updates the startup application window size logic in main.dart to add an intermediate 1024x576 resolution for smaller screens,

It now sets the window size to 1400x822 for screens 1600x900 or larger, 1024x576 for screens 1280x720 or larger, and defaults to 750x450 otherwise.

[ricab]

What does it mean if it is null? Should we fallback to the default or middle resolution in that case?

[levkropp]

If screenSize is null it means that the plugin cannot get the current screen resolution for some reason. Falling back to the minimum resolution is probably safest if this happens

[ricab]

Why though? Isn't it safer to make a compromise?

[levkropp]

I can't think of any situations where serving a larger resolution (when you don't know the size of the screen) is safer than serving the minimum resolution

[ricab]

Safety is perhaps not the best concept here, but when "the plugin cannot get the current screen resolution for some reason", the most reasonable expectation is still that the user either doesn't have graphics at all, or they have 720p or higher (since most screens today have that). OTOH, the smallest size is our least preferred.

We can deal with this better later.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.94%. Comparing base (f01004e) to head (52f139f).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3811   +/-   ##
=======================================
  Coverage   88.94%   88.94%           
=======================================
  Files         256      256           
  Lines       14584    14584           
=======================================
  Hits        12972    12972           
  Misses       1612     1612           

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[ricab]

OK I don't want to delay this any further, so approving.

[ricab]

For some reason GH is encountering some internal error (seen in other PRs too). The runs otherwise succeeded, so merging manually.

https://github.com/canonical/multipass-private/actions/runs/12165023258