refactor(sandbox-preview): extract param label badge styling to constant

[pedrofrxncx]

Summary

Extract the repeated rounded-sm bg-violet-500/15 px-1 py-0.5 text-[12px] text-violet-600 dark:text-violet-400 class string into a PARAM_LABEL_BADGE constant in path-param-picker-chip.tsx. Both the button chip (line 270) and the modal header badge (line 297) use identical base styling—consolidating reduces duplication and ensures visual consistency across both usages.

Verification

• Behavior-preserving: visual rendering and interaction unchanged; styles applied identically via cn() utility
• -4 / +7 net change (8 lines changed total, -11 bytes overall); extracts one unified source of truth
• bun run fmt passes; bunx tsc --noEmit passes in apps/mesh; related path-param-picker tests pass (40 tests)

Technical details

The constant consolidation:

• Eliminates copy-pasted styling strings across two JSX nodes
• Uses cn(PARAM_LABEL_BADGE, ...) to compose base badge with variant classes (e.g., hover:bg-violet-500/25, font-mono)
• No functional changes; same CSS classes rendered in the same order

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Summary by cubic

Extracted the param label badge styles into a PARAM_LABEL_BADGE constant in path-param-picker-chip.tsx to remove duplication and keep the chip and modal badge consistent. No behavior or visual changes.

^{Written for commit d81a2b5. Summary will update on new commits.}