feat: auto position menus

[developit]

Summary

• delegate positioning to show/toggle listeners and drop unused anchor metrics
• replace flip flags with space-separated data-flip and derive offsets from anchor size in CSS
• clear default dialog margins so menus anchor correctly
• temporarily remove popover transforms before measuring so layout nudges don't flip menus back and forth
• flip context menus away from viewport edges using minimal JS

Testing

• pnpm lint (fails: demo project has TypeScript errors)

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https://chatgpt.com/codex/tasks/task_e_68c0e8bb75588321a1bb93503ba048f0

[github-actions]

Size Change: +556 B (+5.3%) 🔍

Total Size: 11.1 kB

Filename	Size	Change
dist/index.css	5.74 kB	+149 B (+2.67%)
dist/index.js	5.32 kB	+407 B (+8.29%)	🔍

_{compressed-size-action}

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