[Feature Request] Add customizable project identifiers/labels to startup banner

Bug Description
Love Claude Code, been using it daily across multiple projects, but this morning I ran into something that could be so much better...

I work on 2 git repos with very similar names side by side in different terminal tabs.
I accidentally started giving instructions in the wrong session and made changes in the wrong repo before I even noticed.
The current banner does show the working directory, but when paths look almost identical, it's way too easy to mix things up at a glance.

How cool would it be if we could customize the startup banner per project ?

• A custom label or color defined in settings.json or CLAUDE.md (imagine a big red "PRODUCTION API" or green "FRONTEND" tag right there when you open a session)
• A more prominent project name display.
• Even just one extra user-defined text line under the path would already be a game changer.

Something like a simple banner.label setting would take seconds to configure and save so much confusion when juggling sessions throughout the day.

Environment Info

• Platform: darwin
• Terminal: Apple_Terminal
• Version: 2.1.45
• Feedback ID: af472752-e6ab-41c5-861d-4384070ad999

Errors

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