chore: better dark mode

bun.lockb

src/config/styling/primitives.css

src/config/styling/variables.css

src/lib/components/pills/Pill.tsx

src/lib/components/pills/PillHandle.tsx

src/lib/data-access/store/schemaSlice.ts

src/lib/querybuilder/pills/customFlowLines/connection.tsx

src/lib/schema/panel/Schema.tsx