Increase click area and contrast for checkboxes all across the platform

Click area & contrast la checkboxes in toata consola (de marit click area + de marit contrastul - nu se vad pe ecrane cu rezolutie mai proasta mai deloc - users miss them/ squint to see them)

The issue names no files, tests, or entry points. Start by locating the checkbox styles or components used across the console, then verify that all checkboxes have a larger click area and sufficient contrast, including on lower-resolution screens.

Written by the indexing model from the issue text.