v2.4.0 — Skill Tracking & Mobile Header Redesign

Features

• Claude Code Skill Tracking: New collector endpoint, DB schema migration, SkillsPanel UI with webhook setup guide and plugin system

Improvements

• Mobile Header Redesign: CSS Grid app bar layout — menu pinned left, logo centered, theme toggle right; controls row with date picker, refresh (icon-only), and updated time
• Light Mode Drawer Fix: Solid white background on mobile (was transparent)
• Mobile Padding: Reduced from 40px to 12px side padding

Fixes

• Order usage legends by cost (descending)
• Sort cost legend by cost value