clapointe-carbonleo reskins Mike in CarbonLeo colours

This fork drops Mike's default light, serif aesthetic for a darker palette built around an olive-gold accent, matching the CarbonLeo/CarbonIQ brand. It's a cosmetic overhaul, landed as a single piece of work: a few thousand lines changed, but almost all of it is colour and styling rather than new capability.

The one functional change is buried in the settings. The page that let each user paste in their own AI provider keys (for services like Anthropic and Google's Gemini) is gone, replaced with a stripped-down view - consistent with the fork moving to centrally-managed keys. Useful if you run one tenant; a step backwards if you host multiple clients who each need their own keys.