feat(tools): add coordinate picker for SVG polygon creation

Interactive tool for picking coordinates from images to create SVG polygons.
Useful for tracing brand icons and creating precise vector graphics.

Features:
- Load images (JPG, PNG, SVG) via drag-and-drop or file picker
- Zoom controls (50% to 400%) for precise coordinate selection
- Multi-shape support with color-coded markers
- Pin sharing across shapes for shared vertices
- Context menu for pin management (add/remove/delete)
- Live SVG preview and full SVG code generation
- Click-to-copy for individual polygons or full SVG

TypeScript library (src/coordinate-picker.ts) provides:
- State management for pins and shapes
- Coordinate calculations with zoom support
- SVG polygon generation
- Serialization for save/load functionality

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

Author: grokify

tools/.gitignore

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+node_modules/
+dist/
+coverage/