refactor: Deduplicate signal metrics mapping between Comparison and Profile views #247

Both ResultDashboard (src/features/comparison/components/result-dashboard.tsx) and UserProfileClient (src/features/developer/components/user-profile-client.tsx) define duplicate arrays mapping user signal fields (reposAnalyzed, pullRequestsAnalyzed, mergedExternalPRs, unmergedPRsIgnored, etc.) to translated labels.

Motivation

Duplicating metric lists creates maintenance overhead when new signal metrics are added to the scoring engine. Extracting a shared helper keeps metrics in sync.

Tasks

• Create a shared helper function (e.g. getSignalMetricEntries(signals, t)) in src/features/developer or src/lib/.
• Refactor ResultDashboard to consume the shared helper.
• Refactor UserProfileClient to consume the shared helper.
• Ensure all translation keys remain identical and typed.