feat add viewport 1200X800

[mateoCuervo]

adding support in cli for viewport 1200x800

Tested

Works with flag --viewport

Works with flag --viewport-interactive

works on dashboard /browsers

[mesa-dot-dev]

Mesa Description

This PR adds a new 1200x800 viewport option for browser testing, a common desktop resolution.

• Added "1200x800@60" to the list of available viewports.
• Updated the --viewport flag's help text to include the new option.
• Updated the unit test in cmd/browsers_test.go to validate the addition, increasing the expected count of viewports from 5 to 6.

^{Description generated by Mesa. Update settings}

[mesa-dot-dev]

Performed full review of 5abf789...4f522e0

Analysis

1. The new viewport option disrupts the existing ordering scheme (by width descending), as 1200x800 is placed after 1024x768, which could impact code maintainability and user experience if these options are displayed in this order.
2. While not a major architectural issue, inconsistent ordering patterns may make future maintenance more difficult and could introduce confusion for developers working with the viewport options array.

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