- Update all :root tokens with lavender-tinted pastel oklch values
- Map --chart-1 through --chart-5 to category base colors (bill, variable_expense, debt, saving, investment)
- Add --success and --warning semantic tokens with foreground pairs
- Register --color-success and --color-warning in @theme inline for Tailwind utility access
- Preserve --card and --popover as pure white (intentional locked decision)
- Leave .dark block unchanged (out of scope)
