area/ui: Add a Color by functionality

[yomete]

This PR introduces a color by feature such that users can now choose how they want their icicle graph to be colored e.g. binaries and filenames.

• Added a new "Color by" item to the "More Action" button to allow users color by either binary or filename.
  
• Also added a "Hidden Binaries" item so that if you filter using a binary and then switch the color by to be "Filename", you still get to see what binary you might have been filtering with previously.
  
• When there's just one binary, we automatically color by filename.

Also contains a fix for #5106

[alwaysmeticulous]

🤖 Meticulous spotted visual differences in 26 of 395 screens tested: view and approve differences detected.

_{Last updated for commit b257b8a. This comment will update as new commits are pushed.}

[manojVivek]

Looks good in terms of the code, but I'll defer to Frederic/Matthias on the functionality.