Color coding for different accounts

I have two accounts and often mistakenly post/boost on the wrong one because the only cue is the tiny profile pic in the corner. It would be helpful if Phanpy let me color-code the accounts.

For example, Semaphore has this per-server option that changes its background color and header bar color:


The issue names no files, tests, or entry points; first inspect the account-switching and appearance/settings areas to find where account identity is rendered. Clarify the intended scope for per-account colors and light/dark behavior before implementation. Done means each account has a distinguishable, persistent color treatment without obscuring the interface.

Written by the indexing model from the issue text.