Add support for 3rd taps and for filtering formulae and casks by tap #295

Before submitting

• I have searched the issues and pull requests for duplicates.
• I am proposing a specific improvement to BrewUI with a use case and a clear outcome.

Problem and use case

BrewUI currently doesn't support user-added taps. Users can only see the tap of each installed app, they can never add a tap or view their installed/trusted taps in BrewUI. This is inconvenient, since users still have to add taps via command line.

Proposed behaviour

We could add a side menu tab listing all taps a user has added. Because each tap maps to a GitHub repo, the list could show each tap's description, author, and GitHub star count. The right pane would show the tap's README (rendered Markdown), a link to its GitHub repo, and a list of all formulae and casks available in that tap.

Alternatives considered

Issue #255 already proposed this. I'd like to know why it was closed as "not planned".

macOS and Homebrew context

macOS 27 (Golden Gate) on Apple silicon, Homebrew 7.0.11, BrewUI installed via git clone.