Replace undefined --lora-accent-l/c/h and --lora-warning-l/c/h with
canonical --color-accent-l/c/h and --color-warning-l/c/h from the
design token system. Fix 5 border-color declarations missing oklch()
wrapper, fix var() space syntax error in .group-toggle-btn:hover,
and replace hardcoded green with --color-success token.