In Tailwind v4, text-secondary resolves to --color-secondary (#2e3140),
a dark surface color — NOT --color-text-secondary (#848b9b). This made
all secondary text invisible on dark backgrounds.
The correct class is text-muted-foreground which maps to #848b9b.
This matches the pattern used by existing FlowPilot components.
Also reverts the unnecessary index.css variable bump from prior commit.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>