Polish Board-Man panel rows and metadata

[uniplanck]

Summary

• Redesign Board-Man panel rows into primary text, metadata, and usage badge areas
• Improve dark-mode row, selection, footer, and preview bubble contrast
• Add visible panel controls for time format and usage count display/style

Verification

• git status --short
• git diff --check
• local path scan on diff
• secret scan on diff
• xcodebuild -project "Board-Man.xcodeproj" -scheme "Board-Man" -configuration Debug -derivedDataPath /tmp/BoardManPhase4CodexFallbackBuild -destination 'generic/platform=macOS' -skipPackagePluginValidation -skipMacroValidation CODE_SIGNING_ALLOWED=NO build