Fix peak traffic chart to match Figma design

Overlay bars instead of positioning side by side, with transparent
hatched "Last month" bars on top of solid "This month" bars. Update
legend icons to circular. Add CLAUDE.md with dev server notes.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CLAUDE.md

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+# Claude Code Notes
+
+## Development Server
+
+Before starting the dev server, check if it's already running:
+- Use `lsof -i :6827` or check for existing background tasks
+- The dev server runs on port 6827 (may fall back to 6828 if port is in use)
+- Start with `bun run --cwd apps/publisher-dashboard dev` or `devenv up`